LXF - 289 - June 2022

THE BEST LINUX APP STORES
Delivering hot open source software direct to your desktop!
Run full-fat Linux on

the Valve Steam Deck
The #1 open source mag
Enter the Linux multiverse with

a rock-solid PC install today! Build a
Five-year long-term support two-playe
Pi reactio r
Improved network shares game! n
Latest hardware updates
All-new Wayland display
PLUS: HOW TO
Quickly clean up your
cluttered hard drive
Run your own email
server the easy way
Emulate the classic
Z80 Amstrad PCW
FULL HOUSE! RUST TOOLS TERMINAL TIPS

LXF June 2022
Start coding your Enhance your skills Manage your ebooks

own card games with filesystem access from the terminal
WELCOME
MEET THE TEAM Jammy upgrades

With this issue’s focus on the latest LTS
release of Ubuntu, will you be upgrading It’s LTS time again! If you’re down
with the Linux lingo then you’ll
to version 22.04 Jammy Jellyfish? If not, already know what this means, but
what are you installing instead? to the rest of the world it’s a Long
Term Support release and for
Ubuntu this comes around every
two years, with 20.04 being the last
Jonni Bidwell such release.
I’ll be keeping my Jammy Jellyfish installed. Why is any of this important? An
It’s not yet stung me. But will it become my LTS freezes development and
new daily driver? I’ll reserve judgement till the provides a stable and secure install
next Pop!_OS LTS comes out, I suppose. Plus that Canonical – the company
there will surely be a plethora of other great behind Ubuntu – guarantees will
Jellyfish-spawn distros with which to burden my bootloader. receive five years of security and kernel updates, with potentially a
further three years (and perhaps as long as five) of Extended
Support Maintenance, although you need to register for this.
Nick Peers It offers peace of mind for those wanting a quiet time of it or
I’ll be installing Ubuntu 22.04 on all my more likely admins who prefer stable, secure and predictable
machines, but not all at once. My desktop will systems to deal with. While non-LTS releases tend to be used to test
be upgraded first, and I’ll hold off updating my up-and-coming technology, the LTS releases are when that tech is
server until some of the early bugs get ironed ready for the prime time. With 22.04 LTS we’re finally seeing the
out. The thought of being unable to access my new graphical stack Wayland implemented with crazy essentials
NickFlix media server sends shivers down my spine… such as remote desktop and screen grabbing working out of the
box. But I won’t spoil all of the surprises here – that’s Jonni’s job,
and he takes you through everything on page 34.
Les Pounder We’re also having fun this issue because we had a Valve Steam
I’ll upgrade my laptop to Kubuntu 22.04. Deck to play with, but rather than use it for its intended purposes
When I first started with Linux I enjoyed KDE, we ran desktop Linux instead. What else were we going to do, play
then I spent some time with Gnome, Openbox games?! There’s also a fun bag of system tools, VM management,
and Regolith. However, for 22.04 I’ll be moving Wine tips and classic retro emulation, so as always enjoy!
back to KDE because it’s been fantastic both
on my desktop and on a Lenovo ThinkCentre.
Michael Reed Neil Mohr Editor

Interesting that you should ask, as I fancy a neil.mohr@futurenet.com
change at the moment, but I’m undecided.
I’ve got years of experience invested into
Ubuntu, but I like what I’ve seen of Mint with
Cinnamon as the desktop. Another route
would be to start with Debian and then customise from there.
Mayank Sharma
Subscribe
I wouldn’t think of letting LTS releases
anywhere near my desktops. I used regular
& save!
Ubuntu releases for the longest time, but I’ve On digital and print
been a Fedora man for the past few years.
Fedora does a bang-up job of running a stable
– see p18
desktop, and has a wonderful update policy that suits me.
www.techradar.com/pro/linux June 2022 LXF289 3

Contents SUBSCRIBE NOW!
Page 18
BULLET-PROOF
REVIEWS
UBUNTU 22.O4
Seagate EXOS 20TB HDD 20
Mark Pickavance is stunned by the storage
but not the endurance of this drive. The
cost is another matter altogether, mind…
Cast aside your old OS

and begin life anew
with Ubuntu 22.04,
says Jonni Bidwell.
See page 34!
HostGator 21
A basic website hosing option for small
and medium businesses that Shashank
Sharma thinks should be on your short list.
Linux Mint Debian Edition 5 22

Whenever there’s a new LMDE release,
Mayank Sharma can’t help but think of the
old adage: “It’s the thought that counts.”
Fedora 36 23
Mayank Sharma calls the latest Fedora
release just as boring as its predecessors.
But is that necessarily a bad thing?
Ubuntu 22.04 LTS 24

If there’s one thing Mayank Sharma likes
even less than Ubuntu, it’s Ubuntu LTS
releases, which are stable but not notable.
A Musical Story 26
Fun, folk and funk are three things that
Management hate with a passion, so
ROUNDUP TOP OF THE FOSS
Tom Sykes has turned down his speakers.
The Last Cube 27

Management isn’t keen on sentient
anything – “it’s bad for productivity” – so
Neil Mohr keeps the thinking to a minimum,
which isn’t helping here at all…
Open source app stores 28 Get packing! 48

Many Linux flavours and open source OSes Are you keen to give back to the FOSS
have their own software stores, Alexander community, but don’t know where to start?
Tolstoy wonders if it’s worth your time Mike McCallister shows you one way to do
browsing their wares. a good deed.
4 LXF289 June 2022 www.linuxformat.com

CONTENTS
Pi USER TUTORIALS
Raspberry Pi news 43 TERMINAL: Reading ebooks 52

Introduced by Linux Format’s own Matthew Shashank Sharma shows how the terminal
Holder. We take a look at the latest moves can serve as the pathway to the myriad
to manage the Pi supply, a new arm is in worlds of book-based storytelling.
town but this one isn’t a processor, and
Arduino takes on the Pi Compute. CZKAWKA: Clean your drives 54
Nick Peers takes a deep dive into this fast-
Armbian 22.02 Jammy XFCE 44 evolving and brilliant tool for finding and
Les Pounder assesses a distro that removing redundant files from your PC.
supports 64 different Linux single board
computers, and now he has to buy them all. EMULATION: Amstrad PCW 58
Les Pounder goes back to school, a time
Arducam 16MP camera module 45 when his form room was full of Z80
Quick-off-the-draw Les Pounder can’t computers and noisy dot matrix printers.
shoot shots faster than this camera, which
is now available to everyone.
Python-based reaction game 46

Les Pounder goes back to the early days of
the Raspberry Pi to look at a board that
made a big difference to his career.
CODING ACADEMY ASSISTANT: Home automation 64

Explore NFC tags, energy monitoring and
File system tools in Rust 90 the Wireguard VPN to expand your smart
Mihalis Tsoukalos explains how to home with Matthew Holder.
manipulate and examine files and
directories in Rust, enabling you to WINE: Run Windows software 68
write filesystem tools. Michael Reed teaches you everything you
need to know about using Microsoft
Updating old blackjack code 94 Windows compatibility system WINE with
Updating old projects can be fun and some handy tips..
educational. Andrew Smith ensures
that your cards are dealt correctly at LXF SERVER: Email 72
any resolution. David Rutland does the impossible and
sets up a VPS-based email server and a
webmail front-end, then writes about it.
REGULARS AT A GLANCE MULTIPASS: Easy virtual machines 76
Stuart Burns helps you to master
News 6 Subscriptions 18 Multipass, the virtualisation platform
How the open source community is reacting Get your monthly Linux dose and save cash! that runs on any desktop system.
to the Ukraine war, a new RISC-V computer,
real Apple M1 support, a rolling Ubuntu
release and Fedora is to be 32-bit no more.
Back issues
Get hold of previous Linux Format editions.
62
IN-DEPTH
Kernel watch 10 Overseas subscriptions 63

Get Linux Format shipped around the globe.
Answers 12
Backing up and syncing Keepass, trying to HotPicks 83
backup PhotoRec files, controlling screen Alexander Tolstoy doesn’t have to worry
mirroring to a TV, sorting out-of-tree module about silly old Russian jokes any longer,
support, plus a look at the tmpfs system. things aren’t really funny any more. But we
still have a fine open source selection
Mailserver 16 including: FireDM, Mplayer, Rnote, Mailspring,
Demands to do more router coverage, Airsane, Fbcat, Topgrade, Superdux, All hands on the Deck! 78
demands that we should be nicer to Bohdi, Winterapples, Casper-fs and Zplora. Jonni Bidwell pries a Steam Deck from PC
demands to be nicer to new users and Gamer’s cold anthropomorphised hands
demands to appreciate Android! Next month 98 and gets his game on.

Newsdesk
THIS ISSUE: FOSS community on Russian war VisionFive V1 SBC
Linux on Apple’s M1 Rolling Rhino Fedora sidelines 32-bit apps
CURRENT AFFAIRS
FOSS community stands

up to Russian atrocities
Russia’s invasion of Ukraine has sent shockwaves around the
world, and it’s keenly felt in the open source community, too.
S
ince last issue, more of the open source staff member stated that “GitHub’s vision is to be
community has spoken out to condemn the home for all developers, no matter where
Russia’s invasion of Ukraine and show they reside,” and it would instead comply with
support for Ukrainians. This includes Scarf “stringent new export controls aimed at severely
(https://about.scarf.sh), an open-source restricting Russia’s access to technologies and
gateway that helps distributes software and other items needed to sustain its aggressive
offers analytics for companies. military capabilities” instead.
In a recent blog post (https://bit.ly/ Red Hat, however, has announced (https:// Many open-source institutions are
lxf289scarf), Scarf’s co-founder and CEO Avi red.ht/3u9MaR7) that it’s ceased sales and having to decide how to react to
Press announced that Scarf will block package services in Russia and Belarus, and has Russian’s invasion of Ukraine.
downloads from the Russian Government. Avi discontinued partner relationships with
had discovered that “Scarf has fulfilled ongoing organisations based in those two countries. To its
software download requests from at least 17 credit, the company has also gone further, by
distinct sources that have been confirmed to organising buses that have “safely transported
originate from the Russian Government,” and several dozen of our
OPEN SOURCE SANCTIONS

that the “notion of Russian government cyber Ukrainian associates’
attack operations leveraging software family members
“Red Hat has announced that

downloaded through Scarf’s platform is across the border to
unacceptable.” Because of this, Scarf will block all Poland,” and the
it’s ceased sales and services

“package and container downloads originating company promises to
from Russian government sources.” Avi also “continue to help
in Russia and Belarus.”

urged other open-source projects, companies those who remain in
and individuals to do the same where they can. the country in any
While many businesses have stopped their way possible.”
proprietary and closed-source products and Canonical followed suit termination all
services from being used in Russia or by the support, professional services, and channel
Russian government, it’s a trickier situation when partnerships with Russian enterprises.
it comes to open-source products. By their very An unethical response from the authors of
nature these are made available to everyone, node-ipc, was releasing malware that erases your
anywhere – one aspect are licences such as the hard drive if you have a Russian or Belorussian IP
GPL that permit military use. address, but has apparently hit aid workers in the
GitHub and GitLab, have resisted calls to limit region. This war has certainly prompted difficult
access for Russians. In a debate on GitHub’s decisions by the open-source community, and
forums (https://bit.ly/lxf289githubforum), a we hope it ends swiftly. Slava Ukraini!

NEWSDESK
HARDWARE OPINION
VisionFive V1 RISC-V SBC on sale FILESYSTEM

After the cancellation of the BeagleV StarFive, a new MONITORING
SBC based on a RISC-V processor is now on sale.
F
or anyone who was upset when the page linked above), seem good, there are some
BeagleV StarFive RISC-V SBC (single odd choices as well. The bump in RAM is
board computer) was cancelled a few welcome, but the LPDDR4 memory is divided
years ago, there’s some good news. StarFive has into two 4GB units clocked at 2,800MHz, which
essentially resurrected it, with a collaboration will offer poorer performance than if it were 8GB Gabriel Krisman Bertazix
with Radxa repurposing the JH7100 dual-core of fully integrated RAM. is a senior software engineer
64-bit RISC-V processor for a brand new SBC: The release announcement at the end of last at Collabora.
the VisionFive V1. year (which you can read at https://bit.ly/
It features similar specs as the previous SBC, lxf289visionfiveannounce) certainly promises
although the VisionFive V1 increases the RAM big things, pointing out that the Neural Network While filesystems
from 4GB to 8GB, and also supports USB PD and Engine, NVLDA Engine and DSP of the device developers do their best to
Quick Charge with its USB-C power port. There’s makes it a “powerful piece of hardware for avoid corruption, it’s
some interesting specifications for this SBC, and human-machine interface, smart home tech, impossible to completely
a starter kit went on sale for $179 (around £140) surveillance, NAS, and even multimedia protect a system from
from https://bit.ly/lxf289 visionfive, although at applications.” It goes on to highlight the board’s accidental issues. Whether
the time of writing the starter kit has sold out, “H.264/H.265 video decoder supporting up to they’re caused by random
and you can’t buy the board on its own either, 4Kp60 and dual-stream decoding up to 4Kp30.” bit flips, disk crashes or
because that’s also sold out, too. software bugs, users don’t
However, the Advanced Kit is still available for enjoy losing their data for
$199 (around £150), which comes with a 32GB no reason. This is why
SD card with Fedora preinstalled (which also filesystem developers put
comes with the Starter Kit), as well as a power a huge effort in not only
The
supply and cable, 40-pin header extension and testing their code, but also
VisionFive
an acrylic case. This SBC can also run other V1 is a single
in developing recovery
Linux distros, and is compatible with the U-Boot board PC tools. In fact, all persistent
and GRUB2 bootloaders. As Electronics-Lab based on filesystems deployed
points out (at https://bit.ly/lxf289e-lab) while a RISC-V in production are
the specs (which can be seen on the product processor. accompanied by some
support infrastructure.
When an error happens,
HARDWARE administrators and recovery
daemons must be notified
ASAP so they can begin
Linux comes to the Apple M1 emergency recovery

procedures, like recover
from backups, rebuild
The first Asahi Linux Alpha release is very promising. RAIDs, replace disks or run
fsck. When one needs to
A
pple’s M1 processor is one of the The ability to run Linux on these new Mac watch over a large quantity
most interesting products the devices is exciting because the ARM-based M1 of machines, like in a cloud
company has made in recent times, chips offer excellent performance and battery provider with hundreds of
and the Asahi Linux project (https://asahilinux. life. However, it’s still early days, and while there’s machines, a reliable
org) brings a customised remix of Arch Linux a growing number of features that now work, monitoring tool is essential.
ARM with the Plasma desktop to M1-powered including Wi-Fi, screen and built-in keyboards, This is why we worked on
Macs and MacBooks. there’s also a huge amount that doesn’t work, a new mechanism based
As the release notes reveal (https://bit.ly/ including DisplayPort (when do they ever work?– on Fanotify for closely
lxf289asahi), Mac and MacBooks that use the ED) connections, Bluetooth, GPU acceleration monitoring volumes and
M1 chip, or the more powerful M1 Pro and M1 and the webcam. There are also plenty of bugs, trigger warnings in real-time
Max chips are supported. However there’s no so this is best left for testers at the moment. when an error occurred. The
mention of the brand-new M1 Ultra chip (which The wait for a more stable release could prove feature, merged in kernel
is essentially two M1 Max chips connected frustrating, however. A post on the r/linux 5.16, won’t prevent failures
via a low-latency connection), and the subreddit (https://bit.ly/lxf289reddit) shows from happening, but will
announcement says that the new Mac Studio, how compiling code is around twice as fast on an reduce their impact by
which is currently the only product to use the M1 Mac running Asahi Linux compared to the ensuring any listener
M1 Ultra, is not currently supported. same Mac running MacOS. receives the message.

NEWSDESK
OPINION DISTROS
TOO Rolling Rhino

CLEVER announced
Rolling Rhino is an intriguing
remix of Ubuntu that turns the
distro into a rolling-release.
A new community remix of Ubuntu turns the

popular distro into a rolling-release project.
A
new community remix of Ubuntu However, caution is advised because Ubuntu
Keith Edmunds has been announced (https://bit.ly/ isn’t designed as a rolling-release, and Rolling
is MD of Tiger Computing Ltd, lxf289rollingrhino). Unlike some Rhino relies on testing versions of the distro,
which provides support for more straightforward remixes, Rolling Rhino which can come out at random times, and can
businesses using Linux. essentially turns Ubuntu into a rolling release also introduce bugs and issues.
distro such as Arch Linux and OpenSUSE Support may also be hard to get hold of
Tumbleweed, using a script to install Ubuntu’s due to the niche nature of this release, so we
We were once asked daily images from the devel branch. recommend that this is only tried out by anyone
to look at a Linux firewall It’s certainly an interesting new way of getting who’s confident about what they’re doing, and
that was in place at a Ubuntu, and the brave souls trying it out will be has methods to roll back to a working release if
Premier League football receiving cutting-edge features and bug fixes. something does go wrong.
club. The firewall wouldn’t
boot, so no one had any
internet access, and that’s
why they called us.
SOFTWARE SOFTWARE
As is often the way, the
firewall has been put in
place by “somebody who
has left.” That somebody
Fedora drops 32- Drawing 1.0.0
had set up the firewall to
PXE boot – that is, to
download its bootable
bit app support released
image from somewhere Others are likely to follow the The open-source MS Paint
else, which in this case
was a file server.
mainstream distro’s actions. alternative hits a milestone.
My first thought was,
W D
“Why on earth would you hile support of 32-bit hardware has rawing is a simple-to-use art tool that’s
set up a firewall to PXE been abandoned by many major considered to be a great open-source
boot?” And hot on the heels distros, none have stopped supporting alternative to Microsoft’s iconic MS
of this question was the 32-bit applications, until now. While Fedora Paint, and it’s now hit a major milestone with
answer: because it’s clever. stopped supporting 32-bit PCs in 2019, version 1.0.0 released. In a Reddit post
Never mind that the developers are now being asked to stop building celebrating the release (https://bit.ly/
firewall now depended upon i686 versions of packages that don’t have any lxf289drawing), rendering performance has
another, unrelated, server to dependencies – also known as “leaf packages”. been improved (although as the post explains,
be able to boot. Look how As a wiki entry (https://bit.ly/lxf289fedora) editing large images using integrated graphics of
clever I am! No disk needed explains, as long as the packages aren’t some CPUs is “still kinda bad but, huh, less than
in the firewall! (Although it depended on by other i686 packages, before.” New keyboard shortcuts have been
had one anyway: it just developers are asked not to put in “significant added, and the Scale tool has also been
didn’t use it.) Oh yes, I investment of time or resources” to support improved, as has zooming. Download the latest
thought, this a clever i686 architecture, and this will no longer be version at https://bit.ly/lxf289drawingdownload.
solution… right up to the considered a breaking change. This could cause
point when it stopped issues for proprietary software such as Steam,
working. Technology is which still features 32-bit games. We’ll be
complex enough without keeping an eye on
adding to the equation. the community
People who work with response to this.
Linux tend to love tech.
That’s fine, but let’s make Fedora is paving the
sure that we keep the way to drop support for
solutions we build as simple 32-bit applications, and
as possible. That’s other distros are sure Drawing 1.0.0 is a great tool for simple and easy image
what’s really clever. to follow. creation and editing.

NEWSDESK
Distro watch
OPINION
EVENTS ARE
What’s down the side of the free software sofa? BACK, BABY!
Q4OS 4.8
This Debian-based distro has a new version out, and is
now based on Debian 11.3. This includes the latest stable
kernel, along with security and bug fixes. The installation
process has also been upgraded to offer a more polished
experience when you’re setting up the distro. As the Q4OS 4.8 is available to download with a Matt Yonkovit
release announcement states (see https://bit.ly/ much-improved installation process. is the head of open source
lxf289q4os), language and localisation support has been strategy at Percona
improved in the API library for various tools as well.
By the time you read

this, I’ll have finished my
first in-person conference
DEEPIN 20.5 since the pandemic.
Another Debian-based distro has a new release out, Themed around the
with Deepin 20.5 bringing in a number of new features PostgreSQL open source
that were suggested by user feedback. Perhaps the database and taking place
most notable addition is face recognition, which enables in San Jose, the Postgres
you to securely log into Deepin by glancing at your Conference brought
webcam. The kernel has also been updated to version together people who
5.15.24, and numerous vulnerabilities have been fixed. wanted to know the latest
To find out more about this new release, see the release happenings around data
announcement at https://bit.ly/lxf289deepin. Biometric logins are all the rage, and and how to manage it.
now deepin 20.5 makes it possible for So what did we learn from
you to sign in using your face. this event? Well, there was a
range of attitudes. For some,
this was their first event out
in two years, and they were
FINNIX 124 apprehensive. For others,
To celebrate its 22nd anniversary, this compact Live CD this was the latest chance
distro has a new version out, which includes several to get out and meet up
fixes, alongside new packages and features. You can with people, chat through
find nearby Wi-Fi hotspots with the wifi-connect helper problems, and learn more.
utility, and RISC-V support has been added (unofficially, Wherever people were in
however, because AMD64 is the only officially supported this range, the event was a
architecture). It’s well worth checking out the entire Finnix is now in its 22nd year, having first great opportunity to share
release announcement at https://bit.ly/lxf289finnix for been released in March 2000. in the world of open source
more information about this release. and the community.
At the same time, we
couldn’t leave behind all
the good things that we’ve
picked up from two years
PARROT 5.0 of remote events. During
This Debian-based distro with a focus on security has a the conference we ran live
major new update out, which the team claims makes streams and online events
“the system extremely stable and flexible.” It now to share the knowledge and
follows a Long Term Support release model, yet with bring a flavour of the event
backporting ensures that its tools are all kept up to date. to those that couldn’t
A new Architect edition has also been introduced, and attend in person.
the aim of this version is to offer a wide range of We’ll be using what we
customisability. Head over to the project’s download learnt in our next open
page at https://bit.ly/lxf289parrot to get hold of the source conference in Austin,
latest version. Parrot is a security-based distro that Texas, in May. If you’re
offers a range of privacy and testing tools. interested in open source
databases, maybe
we’ll see you there.

NEWSDESK
KERNEL WATCH
OPINION
A.OUT WITH
THE OLD
Jon Masters summarises the latest happenings in
the Linux kernel, because someone has to…
L
inus Torvalds announced the release land in the upcoming 5.18 release. At the time of
of Linux 5.17, saying “we had an writing, the merge window is closed and Linus
extra week at the end of this release has posted several release candidates. These
Jon Masters has been involved cycle, and I’m happy to report that it was very include a number of typical “big ticket” items, as
with Linux for more than 22 years. calm indeed.” The latest kernel includes many well as smaller internal changes.
new features, such as support for “Compile The kernel random-number generator has
The end may finally be Once, Run Everywhere” or “CO-RE” BPF been overhauled by RNG (Random Number
nearing for the venerable programs that enable developers to ship Generator) maintainer Jason Donenfeld. The
“a.out” file format. With the BPF (Berkeley Packet Filter, a kind of JITable first of these is that there is now no difference
removal of support from the last small program that’s loaded directly into the between /dev/random and /dev/urandom. The
two architectures that still kernel on behalf of a user) portably without second is a new mechanism to handle the case
implemented it, it’s just a matter recompiling for each target machine’s kernel. of duplicated (at runtime) virtual machines,
of time (perhaps next release). Another new feature is support for a new enabling entropy to be injected in such a way
There aren’t many users of AMD P-State driver, replacing the legacy ACPI that two identical virtual machines nonetheless
“a.out” left out there and readers
P-State driver with an ACPI CPPC-enabled generate different random numbers.
would be forgiven for wondering
one instead. The upshot of this is that those This might happen, for example, if the
what this is. Several decades ago,
before there was ELF (Executable with recent Zen CPUs should see improved duplication were used as a means to quickly
and Linkable Format), there was power and performance management, start up VMs. Each were then personalised
“a.out” and it was the original with the kernel able to more precisely independent of the other and expected to run
way Linux handled binaries. communicate to the platform the desired different workloads, anticipating unique
The year was 1995. I was 13 level of responsiveness to particular randomness for the generation and use of
years old and had just been workloads. In turn, the underlying Zen private keys, and for other security purposes.
accepted into a local university platform is more able to communicate its If things go according to plan, we should
part-time while still in secondary own available capabilities to the operating be summarising the tail end of the 5.18
school. At the same time, the
system, similarly to the intel_pstate driver. development cycle and the preparation for 5.19
great Linux migration from
in the next issue. Which does make us wonder,
“a.out” to ELF was underway.
And it was messy. It was also Linux 5.18 merge window just how far away is 6.0. While it might only be
necessary. “a.out” statically With the release of 5.17 came the opening of symbolic, we’re likely to see a Linux 6.0 release
linked everything (including the “merge window” for new features that will in a few months, perhaps before Linux turns 31.
“shared” libraries) at a specific
virtual memory address,
requiring every library on a ONGOING DEVELOPMENT
machine to be precompiled
into its own location, and the
Catalin Marinas posted a patch updating with IMSIC) aims to improve this
maintenance of central registries
some Arm contacts since Grant Likely performance significantly.
of known locations so as to not
break applications. It was flimsy.
has taken a new role as CTO of Linaro. Byungchul Park posted version 3 of a
There was a better way (ELF), This author has personally known Grant patch series implementing DEPT (which
but it required an incompatible for many years and is very excited for his stands for Dependency Tracker”), a “tool for
“flag day” break with the past. new opportunity. detecting deadlock possibilities by tracking
The early Linux distros (Debian, Anup Patel posted some patches to clean wait/event rather than lock... acquisition
Slackware, Red Hat Linux, SuSE, up IPI (Inter-Processor-Interrupt) support order to try to cover all synchronisation
etc.) migrated as part of an for RISC-V machines. IPIs are commonly mechanisms.” A little feedback came from
upgrade from one GNU C library used for code running on one processor one intrepid tester, and some updates were
(libc4) to another (libc5).
core (“hart” in RISC-V) to signal another that posted, but nothing further just yet. Still, this
Everything needed to be
it needs to perform an action. An example of seems interesting as an extra means to find
upgraded at once – almost
akin to swapping out your entire
this is tearing down an address space that’s potential deadlocks.
disk/filesystem – otherwise been used by multiple other cores which Finally this month, an SVG version of
everything would break at once. may still contain cached data in their local Tux, the Linux logo has been added to
It was a very painful experience TLB (Translation Lookaside Buffer – a kind the kernel in a response to the request
for those who lived it and we still of cache structure). Traditionally, RISC-V had not to add binary artefacts as part of new
remember it today. a less-performant mechanism for IPIs, but documentation (SVG is a descriptive text
Fortunately, “a.out” is more of a new interrupt controller architecture (AIA format for images).
an historical relic, soon to
be museum material.

EXPLORE THE POSSIBILITIES THAT
LINUX HAS TO OFFER
From open-source software to coding masterclasses and Raspberry Pi
projects, get the most from your machine with this exciting array of expert
tutorials, guides and advice from the minds behind Linux Format magazine.
ON SALE
NOW
Ordering is easy. Go online at:
Or get it from selected supermarkets & newsagents

Answers
Got a burning question about open source or the kernel?
Whatever your level, email it to lxf.answers@futurenet.com
Neil
Bothwick
tweaks your
troublesome
Tux to make it
tick smoothly
Q Secrecy without conflict

I use KeePass on my phone, laptop
some data. Because KeePass is read a lot
more often than written, this was a minor
heavyweight with a lot of dependencies,
but there’s a lighter version called
and desktop. I also use Syncthing to sync inconvenience. Even though the database Vaultwarden (https://hub.docker.com/r/
the database among the three devices. file is encrypted, we weren’t comfortable vaultwarden/server), which is more
Syncthing creates “conflict backup leaving it on a remote server, so we suitable for personal usage. Instructions
files” of the KeePass database when data switched to using NextCloud (https:// for setting this up are on the web site.
is updated on more than one device. I’m nextcloud.com) to give basically the same It’s possible to merge the files – sort
looking for a solution, either a way for effect as using Dropbox, but self-hosted. of. Load each one into KeePass and export
Syncthing to not generate these files or However, we then found another it as a CSV file. This has each entry on a
an alternative method of keeping the password storage solution: Bitwarden single line. Then you can combine those
same password database on all devices. (https://bitwarden.com). Bitwarden is files and use sort together with its option
Is there a tool that will enable me to like LastPass, but open source. There are to remove duplicate lines to extract only
verify and combine both KeePass browser plugins for Firefox and Chrome unique entries. You may get duplicates
database files (since it’s encrypted)? as well as desktop and mobile clients. where the password for a site has changed,
Jordan Welch The database is hosted on Bitwarden’s but that’s easy to clean up. If you exported
servers by default, but it doesn’t have to the files as keepassNN.csv, you can
A We went through the same
ourselves and tried several
be. Bitwarden is open source, you can run
the server yourself.
perform the cleanup in one pass with:
$ cat keepass??.csv | sort -u >keepassnew.
solutions. The problem with Syncthing is Unlike NextCloud, where you have to csv
that it is, by its nature, non-interactive. have a web server to host it, Bitwarden Then you can import the new CSV and
When faced with a conflict it can’t ask is available as a Docker image that you save it out as a database. The CSV files
what to do. It either makes a decision can run locally. You just need to open the contain all of your passwords in plain text,
(possibly picking the wrong file), or relevant port on your router if you want so it’s best to save them to a filesystem on
saves both sets of data. to give yourself access from outside. The RAM like /tmp, or a USB stick that you can
Our first approach was to store the database contents are protected by a zero afterwards. Either way, delete them as
KeePass database on Dropbox, so each passphrase, but the database itself isn’t soon as you’re done.
application was working with the same accessible from outside. As a bonus, you
file. It doesn’t avoid the problem of two
programs writing different versions of
can import your KeePass database directly,
making the transition simple.
Q Do you copy?
I’ve got about 30 folders each
the same file, but with KeePass, that only If you’re going to host it yourself, containing a few hundred files. I want
means you may occasionally miss saving the official Bitwarden docker image is a to copy all of the files in all of the folders
into a new folder. Essentially, I’ve used
PhotoRec on an old 3GB IDE drive I found
in the garage and I want to put all the
files into one folder. I’m not bothered
about the names of them because
PhotoRec has given them all obscure
names already.
I’ve been trying to use rsync, but I’m
not sure it can do it. Internet searches
keep resulting in programming scripts
and the obvious:
cp my_file_name.txt my_file2_name.txt
Can it be carried out with a somewhat
simple command?
Kyle Marsh
A The exact method you use depends

on whether there are duplicate
names among the files. If this isn’t the
case, you can do what you want with find :
Bitwarden has desktop and mobile versions, along with browser extensions, as well as this web interface. $ find sourcedir -type f -exec cp {}

ANSWERS
destdir\;
This finds all files of type file –
remember in Linux everything is a file,
but you don’t want to copy directories,
symlinks or any other file-like objects
– and passes them to the command
specified with -exec . The curly braces are
replaced with the name of the file and the
semi-colon marks the end of the -exec
command. It is escaped – putting a slash
before the command – because the semi-
colon would otherwise be interpreted by
the shell. So this command finds every file
in sourcedir, no matter where it is in the
directory structure of that directory, and
copies it to destdir. The problem occurs
if there are files with the same name in
different directories. Adding -i to the cp
command will cause if to stop and ask
before overwriting files.
To keep all the files you would need to Mkchromecast can mirror your desktop to any TV with a Chromecast dongle fitted or built in.
make sure each one has a unique name.
One way to do this is to use the full path of we want to replace is the directory I have seen some Ubuntu videos where
the file, replacing all directory separators separator, which is also a slash. However, they go to the Settings window and in
with a different character. We can do this we don’t want the shell to treat it as its window’s bar, at the right top cornet,
with a bash loop that reads all the files from part of the substitution structure, there is a SHARE button. With that they
the find command and acts on them: so we prefix it with a backslash. We now can share the screen, but it seems to be
$ find sourcedir -type f | while read F; do have the variable name, followed by two only a PC-to-PC VNC connection only,
mv “$F” “destdir/${F//\//-}” slashes to say replace all occurrences and not the Wi-Fi direct connection I’m
done of the next character, which is also a looking for here. Is there any easy to use
The first line runs find as before and slash, then another slash to specify the GUI software to do that?
sends the list of files to a pipe, where the replacement character. Chris Lawson
script reads each file into a variable and There are GUI tools available for moving
acts on it until there are no more files. The
mv command looks a bit messy, but it
and renaming files, such as KRename.
However, because they need you to select
A There are a number of ways to do
this, depending on the desktop and
takes advantage of the Bash shell’s built- files to work on, they generally handle one software you have installed. If you’re
in text replacement options. If you have a folder at a time. running a recent enough version of
variable X, then $X gives the contents of GNOME (at least GNOME Shell 3.34) you
X, ${X/y/z} gives the contents of X with the
first y replaced by z . Add another slash
Q Mirror, mirror on TV
How can I mirror my screen to
can install the Cast To TV extension. It’s a
somewhat fiddly process, but it does allow
like this – ${X//y/z} – and all occurrences a TV in Debian? I can do that easily mirroring video and audio from the full
of y are replaced. The way that we’re using in Windows, but in Debian I think it’s GNOME desktop. See the instructions at
it here look messy because the character missing the necessary software to do so. www.linuxuprising.com/2020/04/how-to-
cast-your-gnome-shell-desktop-to.html.
A simpler option is to use the Chrome
A QUICK REFERENCE TO… TMPFS browser. This used to make use of a Cast
extension, but now it’s built-in. Press the
Linux has more filesystems than you files are stored in memory only, tmpfs is “hamburger” menu button and there
can shake a stick at. There are the fast – much faster than a spinning disk will be a Cast option. When selected, it
traditional disk-based filesystems such and also faster then an SSD. You create will give a list of available devices. If you
as ext2/3/4 and XFS. Then we have a tmpfs from the command line with select one of these now, it will cast the
the all-in-one filesystems and volume $ sudo mount tmpfs /mountpoint -t current tab, with video and sound, to the
managers like ZFS and btrfs, not to tmpfs selected device. If you want to cast the
mention the virtual filesystems using in or from /etc/fstab with a line like entire desktop, press the Sources button
/proc, /sys and /dev. tmpfs /tmp tmpfs size=50% 0 0 at the bottom of the popup to pick desktop
So here’s one more: tmpfs. This is a The size option sets the maximum instead of the default of the current tab.
filesystem that exists only in memory. size of the filesystem, either in bytes or This is a simple solution that only has
When the computer is switched off, its as a percentage of total RAM: 50 per one significant drawback: casting the full
contents are gone – forever. This makes cent is the default. This doesn’t mean desktop doesn’t mirror sound to the TV.
it useful for data that you don’t want that mounting a tmpfs will eat up half There is a third option – a program
hanging around. It’s most commonly of your memory. This is the maximum called Mkchromecast, which is available
used to mount the /tmp directory size; it only uses as much space as it from https://github.com/muammar/
because that’s supposed to be wiped needs to store files. When you unmount mkchromecast. There is a package for
when you reboot anyway. Because the the filesystem, all memory is returned. Debian that’s included in the official
repositories. You you only need to run

ANSWERS
$ sudo apt install mkchromecast

or install it from your preferred graphical
package manager. Once installed and
running, mkchromecast adds a tray icon
that you can use to search for and select
suitable devices for mirroring your desktop.
Q Meddlesome modules
I have two modules that are
causing me problems. They are filling
up my syslog with errors. It’s my fault
because I installed them to keep time on
an Odroid C2 [a 64-bit quad-core single
board computer] in between reboots, but
the battery piece was ripped off and now
I have no use for the modules.
The two modules are aml_i2c and rtc_
pcf8563. I know that I can temporarily
remove them with modprobe -r but they
come back after a reboot. How can I
remove them for good? In addition to making full disk backups, Clonezilla can create a restore disc tailored to your backup.
Billy Howell
and install the latest version from an Clonezilla to create a single bootable image
A If these are “out of tree” modules
then those are not part of the kernel
ISO image.
Alex Dyer
file that contains the backup. Put this on a
USB drive and in the event of disaster, you
package. This means that you can uninstall can boot and restore from the same drive.
them in the same way they were installed –
with your distro’s package manager. If
A Having spent many years mastering
custom ISO images for the Linux
There’s a full tutorial on this on the
Clonezilla web site. The process may seem
you’re using a distro based on Debian or Format DVDs, we can say that what you a little involved, but after you’ve done it
Ubuntu then the easiest way to find out want to do is possible, but not easy. For one once, it should be straightforward to do it
which package installed a file is to search thing, you can’t safely create an install ISO again for the following backups.
for it at http://packages.debian.org. from a running system. Files will change One problem with full disk backups
However, the module names you give during the process, so you will have to boot like this is that they mean not having your
correspond to the ones that are installed from either a live distro or another distro system available while backing up, which
with the kernel. While it’s possible to installed on your hard disk. Second, the discourages frequent backups. We would
remove the module files and rebuild the remastering process is time-consuming, recommend using a traditional backup
module database, this is likely to cause often taking several hours for a run. This program. There are plenty to choose from
more problems than it fixes, and they will was when creating ISOs of 2-4GB for the to run scheduled backups, preferably daily,
only reappear when your kernel is updated. DVDs. Once you start including data from in between your full imaging sessions.
Instead, it’s simplest to leave the your home directory, you could end up with
modules where they are and tell the a much larger image, possibly exceeding GET HELP NOW!
system to not load them at boot time, or the ISO specification and difficult to write
at any later time. To do this create a file in to a suitable medium for booting. We’d love to try and answer any questions Subscriptions: for magazine issues email help@mymagazine.co.uk
/etc/modprobe.d. The name must end Because you’d have to boot from a you send to lxf.answers@futurenet.com,
in .conf and should make it clear what it’s live distro to create the image, you may no matter what the level. We’ve all been
for, so something like /etc/modprobe.d/ as well use one specifically designed for stuck before, so don’t be shy. However, we’re
blacklist.conf. Add a line to blacklist each creating total system backups, such as only human (although many suspect Jonni
module, like so: Clonezilla (https://clonezilla.org). This is is a robot), so it’s important that you include
blacklist aml_i2c available as a live image that can be written as much information as you can. If
blacklist rtc_pcf8563 to a CD or USB stick and boots to a menu something works on one distro but not
This will prevent the modules from that provides options for backing up and another, then tell us. If you get an error
being loaded, but something on your restoring hard disks. In contrast to using message, please tell us the exact message
system was asking for them to be loaded the likes of dd to image a disk, Clonezilla and precisely what you did to invoke it.
in the first place. It could be worthwhile images only the parts of the disk in use, so If you have, or suspect, a hardware
finding out what this was. Searching the it produces smaller images. It can write to problem, let us know about the hardware.
output of dmesg after boot should give a local medium, such as a USB drive, or to Consider installing hardinfo or lshw. These
some clues. network storage. programs list the hardware on your
When backing up a complete drive, it machine, so send us their output. If you’re
Q Instant reinstallation
Do you know any tool to create
saves the partition table and bootloader as
well as filesystem data, so you can easily
unwilling, or unable, to install these, run the
following commands in a root terminal and
an ISO image of your system as is and restore your system back to the state in send us the system.txt file too.
then be installable, with your users, which it was at the time of the backup. uname -a > system.txt
configuration files and everything else? Clonezilla’s ace up its sleeve as far as your lspci >> system.txt
I want to be able to make backups and needs are concerned is that after creating lspci -vv >> system.txt
in case of loss of data or configurations, your backup image, you can then use

ON SALE NOW! PRINT AND DIGITAL EDITIONS AVAILABLE AT
Digital editions are also available on iOS, Android, and more

Mailserver
MAILSERVER
WRITE TO US Route of the problem

Further to the Newsdesk article about Linux malware
Do you have a in LXF287, which finished with “Implementing router-
burning Linux-
level security to help protect any device... is also
related issue
worth investing in”, I wonder whether an article about
that you want to
discuss? Write the main things to check/configure would be
to us at Linux worthwhile? Many of us tend to lose interest, or at
Format, Future least get distracted by other things, after the relief of
Publishing, Quay getting a new router working, and perhaps don’t pay
House, The enough attention to security aspects.
Ambury, Bath, Steve Holmes
BA1 1UA or email Bodhi is indeed great and you should give the distro a whirl. We’d put it
lxf.letters@ Neil says… on the cover disc but oooooooh.
futurenet.com.
It can’t be a good sign when I think “we wrote what?”
This is a good point though, as there are novel a mention in your magazine. However, a few of our
networking configurations that can help community members and our small team feel you
compartmentalise networks and bolster security. I was have missed a few quite important things that make
hoping to get someone to look at OpenWrt (https:// Bodhi what it is. The tiny footprint and lightweight
openwrt.org) that could perhaps be the basis of a philosophy, as well as the quick launcher (Ctrl+Esc)
network feature, as otherwise every other router differs are just a few of the main ones.
so much in configuration and features. We hope that when you next look at desktop
environments or compare distros that you will also
Helping to unlock
Bodhi is great take into account that we are pretty unique in that
the potential of Thanks for reviewing Bodhi again in your most recent we use EFL and not KDE or GDM and have used this
your routers. issue. We’re always humbled and excited when we get to develop Moksha DE. In doing this we are able to
ensure superb performance on older hardware
without compromising on delivering a modern
Another bug bear is that reviewers tend to get
sidetracked with the default theme, which is green.
This can be changed!
Gareth Williams.
Neil says…
Thanks for the feedback. It’s always good to have
specific pointers on what to look into with distros. While
I understand people will be defensive of their projects
and when we come to review and compare anything we
have to be objective, I would say a number of the things
you point out we didn’t actually do, in the LXF287
Roundup that I think you’re referring to.
I don’t think we even mentioned that Moshka was
green (we did that for Linux Mint), plus we specifically
highlighted a benefit of Bodhi is that it is indeed
lightweight while offering plenty of visual bling. In a
Roundup we’re always going to end up skipping over
specifics of what makes a project great, which I can
imagine is frustrating, but we’re limited on space so lots
Helpdex
* For full terms and conditions see: www.futureplc.com/terms-conditions

MAILSERVER
LETTER OF THE MONTH

Don’t dismiss Android
As a long-time reader of Linux Format, I’ve often noted the
inconsistency with which your writers describe the relationship of
Android to Linux. Sometimes you describe it as a type of Linux,
sometimes as an alternative to Linux. The latter isn’t accurate, as
Android is based on the Linux kernel. Android belongs in the distro
branch diagram on page 43 of your tribute to 30 years of Linux
(LXF280), but it’s not there.
The last page of that article (page 45) is the best example I’ve
seen of the inconsistency. Its text includes both “distros, such as
Android” and in the image caption “Android (not a distro)”.
Canonical has fostered a fantastic Q&A forum, which is one reason why It’s both accurate and politically valuable to the Linux world for
Ubuntu and similar are so popular. you to point out at every opportunity that Android is a variant of
Linux, as evidence of its impact.
of details never get a mention, but then that’s why we’ll Gregory Miller, Chicago
still do individual reviews, too.
Neil says…
One-track minds You’re right that we’re being dismissive and inconsistent, I think we
I keep noticing that many established Linux users, were trying to be funny when we wrote “(not a distro)” in the caption.
when dealing with new users, seem to demand that Android certainly is not an alternative and I don’t think we have said
the new person has to change their system setup to as such. As for the distro element, technically Android is a distro: it’s a
fix any problem they might be complaining about. specialised distribution usually for a specific model of phone.
It’s maddening. It’s like a “I’m right, you’re wrong” Although desktop Android x86 fits far more closely to what you’d
mentality – a bit like the old Vim vs Emacs flame normally think of as a distro. It was left out of the diagram (with
wars of years gone by. plenty of others) for space, as it’s not a “dekstop” distro as such.
Say a new user pops up running Ubuntu and We do have a love/hate relationship with Android due to Google’s
they’re running a Nvidia graphics card. If they post permissive nature, but projects such as Lineage OS (based on
online for help, then while there might be some Android) show just how valuable open source and the use of the
useful replies asking for more details, the majority Linux kernel are in this area. Just as people love to proclaim how
of posts will be “I don’t have this problem on Arch”, they’ve extended the life of their laptops or desktop PCs, Lineage OS
“Nvidia is proprietary” or “the Gnome desktop helps to do the same with many mobile devices that would otherwise
sucks, use KDE”. And don’t get me started on be left hopelessly out of date software-wise.
people going RTFM. Let us know if
John Blaze you’d like to see
more Android
Neil says… coverage. We often
“The quickest way to get the right answer online is to discuss it, but our
post the wrong answer,” goes Cunningham’s Law. general sentiment is
Okay, it’s not quite what you’re saying but the natural people would prefer
response for people online seems to be to tell you to see desktop and
you’re doing it wrong. Possibly more to the point here laptop tutorials.
it’s easier just to post “my way works” than to explore
what the person’s actual problems are and how to fix Jonni still has an “ancient”
them. It’s partly why well-managed Q&A forums are original Motorola Moto G
Falcon from 2013 that’s
gold for problem solving. I think the real solution here is
running Lineage OS.
to use those like https://askubuntu.com.
shane_collinge@yahoo.com

SUBSCRIBE Save money today!
SUBSCRIBE
Sign up today and get your
AUSTRIAN AUDIO
YOUR
GIFT! Hi-X15 Over-Ear
WORTH
Do
£89
n’t miss out,
e now!
Headphones
subscrib
Product features
Low-impedance headphones, ideal for
low-power outputs like mobile devices
Soft memory foam earpads to keep you
comfortable during long listening sessions
Foldable all-metal hinges for easy storage
– uncommon at this price range
Detachable 1.4m cable
Designed and engineered in Austria
SUBSCRIBE NOW!
www.magazinesdirect.com/lin/a33x
Call 0330 333 1113 and quote A33X
Save money today! SUBSCRIBE
PLUS: Exclusive access to 1
1) Only available to www.magazinesdirect.com subscribers

the Linux Format subs area!
1,000s of DRM-free
PDF back issues and
articles! Get instant
access back to issue
66 (May 2005) with
tutorials, interviews,
features and reviews.
!
DON’T MISS At linuxformat.com
ars
Includes 5 ye
r &
of Linux Use
Developer
issues NOT FROM
THE UK?
CHOOSE YOUR PACKAGE! Turn to page
for more gre 63
a
subscriber t
deals!
ANNUAL PRINT ANNUAL ANNUAL DIGITAL

EDITION PRINT + DIGITAL EDITION EDITION ONLY
SAVE! SAVE! SAVE!

PLUS! PLUS!
1
Only 9% Only 47% Only
39%
£67.50 £92.50 £54.99
13 issues of Linux Format 13 issues of Linux Format in print 13 issues of Linux Format
in print by Direct Debit and digital by Direct Debit in digital by Direct Debit
Terms and conditions: Offer closes 31 May, 2022. Offer open to new UK subscribers only. Pricing is guaranteed for the first 12 months and we will notify you in
advance of any price changes. Please allow up to six weeks for delivery of your first subscription issue (up to eight weeks overseas). Your gift will be delivered
separately within 60 days after your first payment has cleared. Gifts only available to subscribers on the UK mainland. Gift not available with a digital subscription.
The full subscription rate is for 12 months (13 issues) and includes postage and packaging. If the magazine ordered changes frequency per annum, we will honour
the number of issues paid for, not the term of the subscription. For full terms and conditions, visit www.magazinesdirect.com/terms. For enquiries please call
+44 (0) 330 333 1113. Lines are open Monday to Friday, 9am to 5pm UK time, or email help@magazinesdirect.com. Calls to 0330 numbers will be charged at no
more than a national landline call, and may be included in your phone provider’s call bundle.

REVIEWS
REVIEWS Lxxxx
Seagate EXOS 20TB

Mark Pickavance is stunned by the storage but not the endurance of this
drive. The cost is another matter altogether, mind…
SPECS
T
he Seagate EXOS 20TB is targeted at those
with cloud data centres, massive scale-out
Size: 20TB data centre applications, bulk storage and
Interface: enterprise NAS systems. Whereas the IronWolf Pro was
SATA or SAS meant for commercial and Enterprise NAS to support
RPM: 7,200 the needs of Creative Pro and Medium-to-Large
Max rate: businesses. They look practically identical from the
285MB/s outside, so is the EXOS 20TB just wearing a different
Power: hat from its IronWolf Pro brother?
5.4w idle, The Seagate EXOS 20TB sells for an eye-watering
9.4w max £480. We found the 18TB model for £295. That’s a
Design: Helium 70 per cent price increase for a 2TB, or 11 per cent
sealed increase in capacity. To the casual observer, this
Cache: 256MB is the same 670g block of metal that houses a
MTBF: CMR (conventional magnetic recording)
2.5M hours 7,200RPM hard drive with 10 2TB platters
Warranty: and 20 heads, functioning within a factory-
Five years sealed helium atmosphere.
All the differences are internal, and based on the lack
of weight difference. What differences exist are most
likely firmware based rather than physical. Seagate has
tuned the EXOS for data centre use, where high-capacity
RAID arrays are used for big data applications,
distributed file systems and disaster recovery platforms.
The IronWolf Pro 20TB offered an MTBF (mean time
between failure) is 1.2 million hours, and the yearly
workload is 300TB. The EXOS 20TB exceeds those
levels with a 2.5-million-hour MTBF rating and 550TB
annual workload. That converts into a warranty that
lasts for five years with a TBW of 2,750TB, compared
with the 1,500TBW of the IronWolf Pro.
Another difference is that the EXOS 20TB comes in
both SATA and SAS connections, whereas the IronWolf
Pro is exclusively SATA. For those that use SAS to
connect arrays to multiple servers for fail-over
functionality, this might be another reason for going
with the EXOS, because it doubles the potential
pathways from one to two on each drive.
We found it difficult to separate the IronWolf Pro and
EXOS 20TB in our benchmarking. Both could read and
write at close to 285MB/s in most tests. That’s a 10 per
VERDICT
cent improvement which can be linked to the extra DEVELOPER: Seagate
platter and heads that this drive has over the 18TB WEB: www.seagate.com
model. But unlike the IronWolf Pro, the 20TB design PRICE: £480 SATA (£470 SAS)
shows no improvements in operational power demands
over the 18TB models, and the SAS models uses an FEATURES 9/10 EASE OF USE 9/10
extra 0.4W over the SATA versions at idle. PERFORMANCE 8/10 VALUE 6/10
Endurance Crazy amounts of storage and better than the IronWolf Pro
We had concerns about IronWolf Pro 20TB and its 20TB due to an increased workload.
300TB per year workload. These are addressed to a
point by the 550TB per year workload offered by the Rating 8/10
EXOS 20TB. Doing the same calculations that we did for

Website hosting REVIEWS
HostGator
A basic website hosing option for small and medium businesses
that Shashank Sharma thinks should be on your short list.
B
ased in the US, HostGator
IN BRIEF offers a range of solutions
Thanks to its including shared hosting,
economical VPS hosting, dedicated hosting,
pricing and cloud hosting or even reseller
offerings, hosting. While the dedicated hosting
HostGator plans give the choice of Windows
should appeal to and Linux as the underlying
most beginners, operating systems, all shared
and even hosting and VPS plans are Linux
professionals based. HostGator defaults
and SMBs. The to CentOS 7 for all its Linux
website builder, installations, but you can request
offered as part CentOS 6 if that’s more your speed. cPanel gives you everything you need to control and manage your site.
of the shared The shared hosting plans start at
hosting plans, $2.95 per month for a three-year subscription and might plans include a 45-day money-back guarantee, and you
makes it easy to seem tempting because of the unmetered disk space can also utilise $150 credit for GoogleAds.
deploy a basic and bandwidth. However, the hosting provider will ask The HostGator Dashboard provides quick access to
website in you to scale down usage of the resources if your needs frequently used features such as cPanel, set up email
almost no exceed 25 per cent of the total available resources. accounts, install WordPress and more. The panel on the
time at all. Unlike many other hosting providers that allow left features additional categories such as Hosting,
backups out of the box, with HostGator you must Marketplace, Email & Office, Domains and Billing.
separately purchase the CodeGuardBasic service Unsure how to do something? Begin typing in the
for $2 per month. The service provides daily automatic search box and the site displays matching articles.
backups, 1GB storage space and three restorations per There’s a lot of content that’s sensibly organised, but if
month, and you can also restore the entire site, or any you need extra help, support is available 24/7/365 via
file, to a previous state with a single click. live chat and telephone (toll-free in the US.)
Although the plans include a website builder as We used the service Uptime.com to check the
well, it’s rather limited, and you’d have to purchase a availability and response time of our HostGator site for
separate plan for it if you want to assemble a complete a week. Our site was never down during the monitoring
website spanning multiple pages. period. That’s what we would expect after only a week
of testing, but it was still good to see. Response times
Pleasant surprise averaged 378ms, which is at the slower end of the basic
All shared hosting plans include some of the most used shared hosting market (most providers average
features, including a free email account. This is quite between 200 and 400ms.) There’s better news in
surprising as most hosting providers insist that you HostGator’s ‘worst case’ time. In more than 2,000 tests,
shell out extra for a professional email address that the slowest response logged was only 556ms,
matches your chosen domain name. considerably better than many hosts (the current
HostGator also widely promotes its WordPress average for our last 30 reviews is 891ms).
hosting plans. The cheapest Start plan priced at $5.95
per month for a three-year subscription, with each
renewal at $9.95 per month. The Start plan enables you
VERDICT
to deploy a single website, and limits the number of DEVELOPER: HostGator
monthly visitors to 100,000. Also included is a free WEB: www.hostgator.com
domain name, professional support and SSL certificate. PRICE: From $2.75
Users looking for more resources on their server
must opt for either VPS or dedicated hosting. HostGator FEATURES 8/10 EASE OF USE 8/10
offers three VPS plans, starting at $19.95 per month PERFORMANCE 8/10 VALUE 7/10
(renews at $79.95 per month). It’s also not possible to
customise the plans to your needs, so you must opt for Although the pricing of the shared hosting plans make them
the next closest plan. HostGator’s Baby plan includes a a great starter option for SMBs and professionals, you can
free domain for a year, unmetered disk space, free site opt for VPS or dedicated plans as your website grows.
migration, free email account, SSH access, and one-
click installation of dozens of applications using Rating 8/10
Softaculous package manager and more. All hosting
www.techradar.com/pro/linux June 2022 LX289 21

REVIEWS Linux distribution
Linux Mint DE 5
Whenever there’s a new LMDE release, Mayank Sharma can’t
help but think of the old adage: “It’s the thought that counts.”
L
MDE 5, codenamed Elsie, is
IN BRIEF the latest edition of Linux
LMDE stands Mint’s Debian-based distro,
for Linux Mint and is based on Debian 11. LMDE
Debian Edition, exists because Linux Mint needed a
and as its name fallback option in case Ubuntu made
suggests, such significant changes to the
sources its distro that it no longer became
packages from feasible to use as a base.
Debian. Unlike For this reason, LMDE is also
the main Linux one of Mint’s development targets,
Mint release, and helps guarantee that its
which is based homebrewed software work
on Ubuntu. In outside of the Ubuntusphere.
the project’s Given its objectives, LMDE strives
own words, the to be as similar as possible to Linux
distro exists to Mint. One of the reasons for Mint’s LMDE 5 is well stocked, and fully usable right-out-of-the-box, thanks to a host of desktop
ensure Linux popularity is its Cinnamon desktop software you won’t find on a stock Debian installation.
Mint continues environment, which sports familiar-
to deliver its looking desktop furniture, unlike the now-defunct Unity These quibbles, taken along with LMDE’s lack of
goodies, even if desktop, and even the new-fangled Gnome 3 desktop original distro-specific documentation, and the project’s
Ubuntu were that’s the default on Ubuntu. own raison d’être, leads us to believe that perhaps the
to disappear. The similarities don’t end with the Cinnamon Linux Mint project itself looks at LMDE as more of a
desktop. In fact, with LMDE 5, Linux Mint has tried to showcase, rather than something you’d want to run
SPECS replicate the desktop experience of the latest edition of on a production machine.
Linux Mint 20.3, with some noticeable differences. The one key difference between LMDE and Mint
CPU: Any x86 The first is the mechanism for transferring the ISO to is that the former is available for 32-bit machines as
processor a USB drive. According to LMDE’s release notes, the well. This leads some to suggest that LMDE is a good
Mem: 4GB distro’s ISO uses a different structure than the ones distro for older machines. We have our doubts though,
recommended used by other distros, such as Linux Mint, which means because LMDE chooses to ship only with the Cinnamon
HDD: 100GB that it isn’t compatible with multiboot tools such as desktop. Although Cinnamon isn’t as resource hungry
recommended Yumi, and has to be manually dd’ed onto a USB. as Gnome 3 or KDE 4, it also isn’t as lightweight as Mate
Build: 32- Another difference is the installer. LMDE doesn’t use or LXDE, that both offer a lot more bang for the buck on
and 64-bit the installer it does on Linux Mint, but it’s just as easy to older, underpowered machines.
navigate. The only real difference is the partitioning step. There’s no denying that LMDE is an important distro
While both the Linux Mint and LMDE installers support for the Linux Mint project, but from the looks of it, LMDE
automatic partitioning, if you need to manually partition isn’t worked on with the same urgency and priority as
your disk, LMDE fires up Gparted instead of handling the main edition. We have no issues with that, but it
this within the installer, like Linux Mint. does prevent us from recommending the distro for any
real use case beyond satisfying one’s curiosity.
Proof of concept
The other differences aren’t as innocuous. For starters,
LMDE hardly has any documentation of its own. The
VERDICT
project relies on documentation from the main distro, DEVELOPER: Linux Mint
which is fine for the most part since the distros are so WEB: https://linuxmint.com
alike. However, for tasks such as upgrading drivers, the LICENCE: Various
instructions don’t work in LMDE because the distro
doesn’t include the driver manager. FEATURES 7/10 EASE OF USE 8/10
Furthermore, LMDE is only offered with the PERFORMANCE 8/10 DOCUMENTATION 5/10
Cinnamon desktop, unlike Mint that comes in several
flavours. Then there’s the fact that LMDE 5 comes about Unless you’re a Linux Mint developer, we’d suggest you stick
seven month after the release of Debian 11. Even then to the project’s main release, which is where all the action is.
the developers haven’t yet published the steps for users
of LMDE 4 (LMDE doesn’t have point releases) to Rating 7/10
upgrade to the latest release.

Linux distribution REVIEWS
Fedora 36
Mayank Sharma calls the latest Fedora release just as
boring as its predecessors. But is that a bad thing?
enerally speaking, it’s
IN BRIEF
One of the top
G difficult to become excited
at Fedora releases. And
RPM-based that’s a good thing. Unlike its often-
desktop distros, fidgety peers, the Fedora developers
Fedora also toils quietly keep cranking out releases.
hard to ensure it Usually there’s hardly any noticeable
delivers the best difference, and most of it can be
Gnome desktop. attributed to the Gnome desktop
Supported by environment. The majority of
Red Hat, which changes in Fedora usually happen
employs several behind the scenes, and manifest
Fedora core themselves in the nooks and
developers, crannies of the userland in very
Fedora serves as subtle, but important ways.
a playground for And the developers don’t intend Fedora 36 is the latest Linux distribution to offer users a dark mode interface that can be
bleeding-edge to change this winning formula with switched on easily with a single click.
features to the Fedora 36 release. The most
mature before obvious evolutionary change in the distro is the Nvidia graphics, is that the release will use the Wayland
they make their inclusion of the Gnome 42 desktop environment, which server even on installations that use the Nvidia driver.
way into Red is also part of the Ubuntu 22.04 release (see page 34). Elsewhere, the rpm-ostree Fedora 36 variants, such
Hat’s enterprise However, unlike Ubuntu’s tweaked rendition, Fedora 36 as Fedora Silverblue, will now have the /var directory on
offerings. ships with a more or less pristine Gnome 42 release. a separate subvolume to help users maintain snapshots
The highlight of Gnome’s latest version is a system- of dynamic data separate from the system snapshots.
SPECS
wide dark theme, with wallpapers for both dark and light In the same vein, the RPM database has moved from
themes, and tweaks to the folder icon theme to bring /usr to the /var directory, which again will simplify
Minimum their appearance in line with the desktop. snapshots and rollbacks, especially for admins. This is
CPU: 2GHz The new desktop also brings an improved cache of being touted as one of those changes that come into
Memory: 2GB programs, many of which have been ported to GTK4. being in Fedora, and will eventually get replicated in Red
HDD: 20GB The move to GTK4, thanks to all the behind-the-scenes Hat Enterprise Linux, after it gets a shakedown.
Builds: x86-64, work, will add a spring to the step of these applications, All things considered, Fedora 36 is like any Fedora
AArch64 along with subtle changes to make them appear more release: pleasingly rock-solid and stable. In fact, we’ve
modern. The most noticeable change is the new been tinkering with the code-complete Beta release,
interactive screenshot tool that can now also record which came out after missing a couple of deadlines
screencasts of the screen or a part of it (in the WebM (another testament to Fedora’s insistence on stability
format), in addition to taking static screenshots. The over anything else). We didn’t encounter any bugs
release also brings a replacement to the Gedit new text during our testing on real and physical hardware, and
editor. The new one’s simply called Text Editor, and in are confident the Beta bears a very strong resemblance
addition to the improved UI, the GTK4-powered tool to the final release, which at time of writing is currently
also includes useful new features, such as auto-save. scheduled for release before the end of April.
Deep extra cover

A Fedora release is made up of several distros. Besides
VERDICT
the Fedora Workstation release that’s designed for DEVELOPER: The Fedora Project
desktop users, there’s also Fedora Server, and Fedora WEB: www.fedporaproject.org
IoT designed for their namesake environments. These LICENCE: Various
will soon be joined by Fedora CoreOS, for cloud
computing, and Fedora Silverblue, which delivers FEATURES 8/10 EASE OF USE 9/10
an immutable desktop ideal for containerised- PERFORMANCE 8/10 DOCUMENTATION 9/10
environments. While Workstation defaults to Gnome, the
project has a few official spins for desktop environments. As good as any release for new users to get into Fedora, and
A notable change in one of these, the LXQt spin, is the a must upgrade release for existing users.
inclusion of the 1.0 release of the lightweight desktop.
Looking under the covers, one of the most relevant Rating 8/10
changes for desktop users, especially the ones with

Ubuntu 22.04 LTS

If there’s one thing Mayank Sharma likes even less than Ubuntu, it’s
Ubuntu LTS releases, which are notably stable but not notable generally.
nlike regular releases, long
IN BRIEF
One of the two
U term support (LTS) releases
like such as 22.04 code-
main Gnome- named Jammy Jellyfish aren’t
bearing distros, designed to show off new features.
arguably Ubuntu Instead, LTS releases focus on
helped put Linux stability over anything else.
on the radar of all Ubuntu will support Jammy
kinds of desktop Jellyfish for the next five years. Even
users. Ubuntu, after the expiry of that period
like its nearest enterprise customers can pay for the
rival Fedora, is Extended Support Maintenance
supported by (ESM) contract to ensure their 22.04
a for-profit installation is supported for another
company. The three to five years.
developers also Because of its focus on stability, The eagle-eyed would probably notice that after over a decade, Ubuntu 22.04 ships with a
use Ubuntu to the developers are reluctant to revamped logo with a contemporary lift to the Circle of Friends promise.
spin distros for a bundle the latest bleeding-edge
variety of use- versions of the core components that do the heavy lifting. changes and applications, which are visible in Fedora 36, a
cases, from the However, it’s unfair to compare LTS releases with regular majority of the default Gnome tools in Ubuntu 22.04 are
desktop, to the releases that Ubuntu churns out every six months. from Gnome 41. Thanks to the LTS nature of the release,
data centre, So while Ubuntu 21.10 users won’t notice any stark Ubuntu has erred on the side of caution and avoided
and everything differences in the 22.04 release, Jammy Jellyfish will be a including any Gnome program that have been ported to
in between. breath of fresh air for users on the previous LTS release, the GTK4 library.
Ubuntu 20.04 Focal Fossa. For instance, Jammy Jellyfish continues to roll with the
Gedit text editor and the old Terminal tool, which have
SPECS Is there a Gnome at home? been replaced by new variants in Gnome 42. The one new
CPU: 2GHz The first noticeable change in the distro is the placement Gnome tool that Ubuntu 22.04 does include is the new
Memory: 2 GB of the Home and Install icons in the bottom-right corner Screenshot tool, which can also record screencasts.
HDD: 25 GB of the screen, from their traditional position on the top left Similarly, Ubuntu’s Yaru theme (now sporting orange
Build: x86-64, corner. Yet the difference worth noting is the inclusion of instead of purple) and its icon set have been ported to
Arm, RISC-V Gnome 42, which is the latest edition of the popular work with the latest Gnome desktop. In addition to the
desktop environment. In fact, Fedora, which prides itself new lick of paint, customisers will appreciate that they
for bundling the latest Gnome desktop, also includes can now select different accent colours to tweak the
This being an LTS Gnome 42 in its latest release, Fedora 36 (see page 23). appearance of various elements on the desktop, including
release, Ubuntu Unlike Fedora however, Ubuntu ships with a folders and the notification area.
treads cautiously
and continues to
customised version of the desktop environment with a If you like customising your desktop, you’ll love the new
use Pulseaudio handful of extensions and other tweaks to make it Personalise section in the Settings panel, which houses
as default sound conform to their user experience expectations. various settings to help you adjust important aspects of
server rather Furthermore, while Gnome 42 brings in some radical new the desktop such as the dock. For instance, you can use
than Pipewire.
the Personalise section to switch between light and dark
versions of the Yaru themes, change the layout and
behaviour of the dock, and lots more.
The one major graphics improvement that isn’t
noticeable is the distro defaulting to running Gnome
on Wayland, even when the installation is using the
proprietary Nvidia driver. This has been the default
behaviour for Intel and AMD Radeon graphics hardware
since Ubuntu 21.04, and will now work on machines using
drivers newer than the Nvidia 510 series driver.
Under the covers

Although 22.04 is an LTS release, which shouldn’t include
any features that degrade the user experience, it does
include a version of the Grub bootloader, which has
deliberately disabled the OS Prober. This means that

Linux distribution REVIEWS
ELSEWHERE IN THE UBUNTUVERSE

An Ubuntu 22.04 LTS release doesn’t just include the main Gnome-
based distro, but also pushes out new releases for the Ubuntu Server,
along with updates to downstream distros such as Kubuntu, Lubuntu,
Ubuntu Budgie, Ubuntu MATE, Ubuntu Studio, and Xubuntu.
One of our favourites is Ubuntu Budgie, which in the 22.04 release
features a slightly tweaked default layout, with the icons in the panel
now having additional spacing to ensure they don’t appear cramped.
The release also yanks the Gnome Control Center from the distro, and
replaces it with the Budgie Control Center. In terms of usability, hot
corners in Budgie sport an option to delay their activation.
The Software & Updates tool includes an Ubuntu Pro tab, which is a Then there’s Ubuntu Studio that uses the same KDE Plasma
premium subscription service for business users. desktop environment as the official Kubuntu release. Note that due to
the change in the desktop from Xfce (20.04) to KDE, Ubuntu Studio
when you install Ubuntu 22.04 LTS on machines which users don’t receive an upgrade path from the older release. However,
already have an existing operating system, such as upgrades from Ubuntu Studio 21.10 work as advertised..
Windows, Jammy Jellyfish won’t add an entry to boot into
that other OS in the GRUB menu. The Grub project
decided to remove the package to counter potential
security issues with the OS Prober component. You can,
however, modify the /etc/default/grub file and toggle the
GRUB_DISABLE_OS_PROBER setting.
Another change that won’t be apparent is the switch to
the Snap version of Firefox. This move is the result of the
combined effort of Mozilla and Ubuntu, which both argue
this will enable developers to push security updates faster
and consistently. In our testing, after initial launch, the
Snap version of Firefox performs just as well as the native
.deb package did earlier.
Ubuntu 22.04 also boasts of improved hardware
support beyond the x84-64 architecture. For starters, you
can now run the distro together with a full desktop for the In 22.04, Ubuntu
Raspberry Pi 4 with 2GB RAM. Note that since the release kernel such as the 5.16 release, which packs in quite a lot Budgie’s welcome
app offers the
of Ubuntu 21.10, the distro already works on the 4GB and of new functionality.
option to install the
8GB variants. But thanks to the use of zswap, Ubuntu To continue what we touched upon at the start of this Microsoft Edge web
22.04 can now run even on the lowly 2GB variant. review, an LTS release isn’t a natural upgrade path for browser, as well as
Furthermore, starting with this release, the Ubuntu those on the regular releases. An LTS release, such as the repository for
developers will also put out a live image designed Ubuntu 22.04, is meant for those running the previous the Brave browser.
specifically for the RISC-V architecture. LTS release, and the changes, even in the conservative
release, will be much more dramatic for such users.
Prioritising stability Remember, however, that if you’re running the
Ubuntu 22.04 is powered by the Linux 5.15 kernel, previous 20.04, which is still supported until at least April
which itself is a LTS release, and brings some notable 2025, and perhaps even until 2030 under the ESM, you
improvements. In particular, there’s a brand-new won’t be prompted to upgrade to Ubuntu 22.04 until the
implementation of the NTFS file system to read and write release of its first update, namely Ubuntu 22.04.1 when
data to NTFS partitions and disks more efficiently. any teething issues should have been ironed out. Of
However, had this been a regular Ubuntu release then course, that doesn’t prevent you from manually initiating
the distro’s developers would have gone with a newer the update process earlier as well.
VERDICT
DEVELOPER: Canonical
WEB: www.ubuntu.com
LICENCE: Various
FEATURES 7/10 EASE OF USE 8/10

PERFORMANCE 8/10 DOCUMENTATION 8/10
A good distro for those looking for stability over freshness. If

you need the latter, stick with the regular Ubuntu releases.
KDE users can experience the advantages of the latest LTS release Rating 8/10
through Kubuntu 22.04, which ships with KDE 5.24.3.

REVIEWS Musical instrument game
A Musical Story
Fun, folk and funk are three things that Management hate
with a passion, so Tom Sykes has turned down his speakers.
uitar Hero is about the
SPECS
Minimum
G fantasy of being a rock
legend, but A Musical
OS: Ubuntu Story is about the reality. There can
18.04 64-bit be no whiffing of notes here, and no
CPU: 1.5GHz strutting around your living room like
64-bit a rock god. This is a tough, unusual
Memory: 4GB rhythm game that insists on
GPU: Integrated perfection for each of its instrumental
HDD: 3GB songs. That’s perfection through
repetition, through learning each
rhythm and getting a feel for the The story element of A Musical Story
is told through classy animation.
music. It’s probably a more accurate
representation of the process of
learning a song. Real rock stars don’t get a timeline Even if you master the music, you’ll never get to play a
showing them when they need to hit each note. full song. You only perform brief snippets in A Musical
So it goes in A Musical Story, a game where the Story. You’ll do a bass loop, then maybe the drums and
timeline has (mostly) disappeared. Instead, you need guitar, before finishing things off with a dusting of lovely
to learn the tempo and rhythm of each tune. It’s an synth. To be fair, this is an approach that keeps the music
uncompromising rhythm game, and we like it for that. fresh and the challenge level high. But it also means that
After passing each exam-like song section, you’re when you’ve finally perfected that guitar riff or drum loop,
rewarded with another story chunk, which is told via mastery is essentially thrown away. You’re not given the
animation and (surely) the game soundtrack of the year. time to demonstrate, to enjoy your new skill before the
game shunts you on to something new.
We’re going on a road trip! It feels like A Musical Story is a game caught between
While you’ll flit between multiple instruments, the story two worlds, something immediately evident when you
follows the guitarist of a 1970s rock band, as the gang look at the screenshots. There are the cutscenes, and the
embarks on a road trip to the Pinewood music festival. gameplay, and they don’t meaningfully connect – so
But it’s much more a game about the guitarist’s drug much so that the story fades out, so as not to be a
addiction, as represented by the crows that begin to distraction. There’s a fantastic, varied soundtrack that
intrude upon his perception of reality. gels perfectly with the animation, morphing from one
There’s no dialogue, but it’s not needed thanks to genre to another, as best suits the scene.
the quality of the visual storytelling and the exceptional Despite these issues the rhythm mechanics are strong,
soundtrack. Funk rock gives way to folk and 70s synths, paring the genre down to its basics while still making it feel
and extended maths rock sections that will really test your like you’re playing a real instrument. A Musical Story wrings
ability to tap, and hold, in time to invisible tempos. a lot of challenge out of just two buttons or keys. You’re
Some help is offered in the form of a subtle position only ever tapping or holding one, the other, or both at once,
marker that activates if you fail repeatedly, and which but it takes skill to get the rhythm of each song down.
disappears when you improve. You’ll mess up a lot after We just wish the game knew what it wanted to be: a
the early chapters lull you into a false sense of security. story you experience, or a set of challenges you master.
As it is, it’s somewhere awkwardly in the middle.
VERDICT
DEVELOPER: Glee-Cheese Studio
WEB: www.glee-cheese.com
PRICE: £11.39
GAMEPLAY 7/10 LONGEVITY 7/10

GRAPHICS 7/10 VALUE 8/10
Great music, delivered in frustratingly bitty form. A clever

rhythm game that doesn’t mesh with its prominent story.
A rhythm section
with concentric
circles. Because Rating 7/10
why not?

Puzzle game REVIEWS
The Last Cube

Management isn’t keen on sentient anything, it’s bad for productivity, so
Neil Mohr keeps the thinking to a minimum which isn’t helping here at all…
xciting game characters of
SPECS
Minimum
E our time: Zelda, Lara Croft,
Mario, Sonic and, erm, a
OS: Ubuntu cube? No, not any cube but The Last
16.04 64-bit, Cube! At its heart this is a straight-up
SteamOS logic platform puzzler, based on
CPU: Intel or those classic top-down logic puzzles
AMD 2.2GHz where you’re using lasers and prisms
dual-core to unlock the end block.
Memory: 4GB Here The Last Cube sees our cubic
HDD: 2GB hero(ine?) rolling – for cubes can
GPU: OpenGL indeed roll – around a 2D world. You
3.0+ compatible can add powers to each face of your
cube through what the game calls
Who would live in a home like
Recommended stickers and there are Lore cubes
this? Oh, a Cube,
OS: Ubuntu that will drop narrative hints as to
20.04 64-bit, why all this is happening, but they feel
SteamOS more of an afterthought than core in any way. There are passing distractions with what the game
CPU: Intel or Here lies much of the fun and frustration in The Last calls relics dotted around levels. These are hard to miss,
AMD 2.7GHz Cube, as you roll your cube around a level attempting but gain you nothing other than a sense of achievement
quad-core to land that sticker face-down on the correct square. rather than something that aides you in-game.
GPU: Nvidia But why? The paper-thin plot of The Last Cube is as This would be challenging enough, but the game
GTX 970 or inconsequential as you’d expect: something about the throws in more devious tests. Once a level is complete
AMD RX 570 Enormous Cube crumbling due to the internal problems you’ll be given a challenge stage. It could be as
destroying it. Only by completing each zone can The Cube straightforward as a time challenge, or ensuring that you
be rebuilt and just by chance there’s a zone for each side don’t lose a sticker. These are maddening because it feels
of a cube, that’s six if it needed pointing out. as though there’s little to no room for error, so you’re
more being tested than having fun.
Mix ‘n’ match The game is beautifully presented. The six biomes
Environmental obstacles such as rivers and electrical have a clear theme, from natural-looking ice, desert and
blocks in each zone will wipe or reset your cube, and lava stages to the more abstract and sci-fi TRON worlds.
switches will only activate with a matching symbol. The zones are accessed from a central hub, so if you
Key to completing every level is planning your route, become frustrated with one area you can try another, and
ensuring the correct stickers are active and that you it’s likely that you will at some point – if not many points!
land on the correct square. If you enjoy puzzle games you’ll find The Last Cube
Stickers are colour-coded, too. This element comes entertaining. It lacks the character of, say, The Talos
into play depending on what sticker is showing on top of Principle, its slim plot and the spartan world means many
a cube. Blue rotates your cube on the spot, green will find it lacking. Add with the sometimes challenging
creates clones, yellow offers a slide move that can break puzzles some might also find it too frustrating as you find
obstacles, and red creates staircases. yourself endlessly rotating a cube, trying to place a single
side down on the right square.
Environments are
varied and polished.
VERDICT
DEVELOPER: Improx Games
WEB: www.lastcubegame.com
PRICE: £15.49
GAMEPLAY 7/10 LONGEVITY 7/10

GRAPHICS 7/10 VALUE 8/10
A clever, good-looking and rewarding puzzler, although it’s

exhausting and frustrating at times.
Rating 7/10

WE COMPARE TONS OF STUFF SO YOU DON’T HAVE TO!
Roundup
AppCenter Bauh Discover
Gnome Software HaikuDepot
Alexander
Tolstoy
is going on a
shopping spree,
but this time it’s
to open source
software stores!
Open source app stores

Many Linux flavours and open source OSes have their own software stores,
Alexander Tolstoy wonders if it’s worth your time browsing their wares.
HOW WE TESTED…
There are several criteria that

enable us to make a fair
assessment of software stores.
The first and the most obvious
one is whether it actually works
and does the job it’s meant for.
This isn’t as silly as it sounds
because – as we’ll find out later
– some stores have difficulties
in installing software.
Another criteria is how much
information does a store
provide on its ‘product card’.
For inexperienced or non tech-
savvy users that can be a
crucial feature that can tell a
story about a program.
Next, we take a look at a
store’s product offering, which
reflects our expectation of
finding enough high-quality
applications for work and play. his is the first time that we’ve put visually appealing items are a better
Having several software
sources and various package
T software stores up against each
other, to identify the most
showcase of what the modern open source
ecosystem has to offer. We’re looking at the
formats available in a store is compelling option. This is because stores five most established stores. These are the
certainly the right way to gain have started to play a significant role in two desktop-specific stores Gnome Software
extra points in our test, and modern Linux operating systems and have of Gnome and KDE Discover of Plasma
here we’re looking at Flatpaks, become a factor of their appeal, for those KDE; two OS-specific – the AppCenter of
Snaps and AppImages. who either want to try Linux, or are thinking ElementaryOS and HaikuDepot of Haiku; and
How an app store looks and of switching their current OS. finally one universal and distribution-agnostic
feels was also taken into Historically, Linux distros had package store, which was Bauh (which we covered
account because essentially managers, and these still exist. However, a in Hotpicks from LXF266). Technically,
it’s a good indication of how package manager normally lists thousands of HaikuDepot isn’t Linux software (you can’t run
user-friendly a store is. Let’s packages that are mostly seen as internal it on Linux), but it’s a good example of how an
dig into some details… technical ‘stuff’ by consumer-level users. open source app store affects the public’s
That’s why stores, with their curated and perception of an operating system.

Open source app stores ROUNDUP
First-launch
experience
Do the stores load quickly, so that
you’re not left watching the clock?
e performed cold starts of all our stores to see how fast
W they become responsive and ready for action. Three out

of the five stores use the PackageKit as their main back-
end: Gnome Software, Discover and AppCenter. We expected them It’s a pleasure to discover new programs using Gnome Software, once the software
to show equal start-up routines, but there were differences. catalogue is downloaded. The user experience is sleek and distraction-free.
The Gnome Software’s integration with PackageKit was almost
perfect and made the store work smoothly. On first launch it little while and the load time was longer than some of the other
displayed the ‘downloading software catalogue’ banner, but after stores, although we were confident it would get there in the end.
this the start-up time was significantly reduced. No delays, no On its very first start HaikuDepot politely asked if we wanted to
annoyances. KDE’s Discover was a bit slower: we had to give it permit the collecting and uploading of anonymous usage data
some time and then restart it to make the store work as expected. online. After that it loaded the main interface window, which
In the early days of ElementaryOS 6 there was a major remained empty until the store fetched repository data. We were
usability problem with AppCenter, which took too long to warm up notified about the current progress in the lower part of the
and didn’t react quickly to the user input. However, this is no window. Although HaikuDepot provided us with good feedback
longer the case, and the store in the latest EOS 6.1 loaded up about what was going on, it was the slowest of the five software
instantly, enabling us to install new programs without delay. We stores. Subsequent runs of HaikuDepot still had the ‘synchronising
didn’t touch the amount and variety of the available programs in package data’ phase, which was a bit of annoying.
this test, so we spotted no further issues with AppCenter. A small
iOS-styled spinner rolled in the right-hand corner of the window, VERDICT
but the store remained ready for action.
Bauh’s approach for starting up was significantly different. It GNOME SOFTWARE 10/10 BAUH 8/10
refreshed its catalogue every time we launched the store so that DISCOVER 8/10 HAIKUDEPOT 7/10
no internal updates took place later on. Once Bauh has chewed APPCENTER 10/10
through all the repo updates it became operational. It did take a Gnome Software proved most responsive. Haiku’s app manager is a little laggy.
App description
How much useful information
is in each product card?
e compared the details that could be found once we
W selected a program and wanted to know more about it.

Each store provided some kind of description, but the
amount of details, stars and reviews differed. We wanted to
compare product cards of the same program across the five
stores, and it worked out fine in all cases except for AppCenter, Package information in Bauh is available on-demand. Press the ‘?’ button and an
which only showed a limited selection of curated applications extra window with a detailed program description will show up.
developed primarily for EOS.
As for Gnome Software, Discover and AppCenter, all these press the ‘?’ button next to the program name to access its details.
contenders relied on the same AppStream framework for distro- A screenshot option was also available. Software pages in
agnostic application descriptions. Yet their product cards were AppCenter were the most visually appealing, with large screen
very different. Gnome Software had the most verbose and diverse images and well-spaced out areas of text. Unfortunately, they
description page that included size, versions and version history, provided less information than Gnome Software.
ratings, users’ comments, and even extra add-ons. The same
program had a much smaller description in Discover with only VERDICT
some package details, screen shots and user reviews.
HaikuDepot featured a detailed program rating system that GNOME SOFTWARE 10/10 BAUH 7/10
showed quite a lot of data in the lower panel below the main list of DISCOVER 7/10 HAIKUDEPOT 8/10
programs, including ratings, reviews and changelog. Bauh was less APPCENTER 6/10
oriented on providing program data cards, instead operating like a Sometimes a well-filled program description entry in Bauh gave us more
convenient package manager, such as Synaptic. Still, we could information than an AppStream-powered metadata document in other stores.

ROUNDUP Open source app stores
Variety of app sources

Do these stores give
you enough choice? Gnome Software 6/10 Discover 8/10
Normally Gnome Software pulls the local The official KDE Plasma store may have its
he number of available PackageKit subsystem and enables users own drawbacks related to stability or UI
T applications is, of course,

never cut and dry, because it
to install all programs that have properly
configured AppStream metadata cards.
design, but when it comes to the variety
of available software, it has few equals.
depends on the Linux distributions. But This store also sports out-of-the-box Discover has three back-ends, namely for
a lot of thing still happen on the store support for Flatpaks (both technologies PackageKit, Snap and Flatpak sources.
side. Thus we treated the PackageKit have strong ties with the Gnome project). If you want to give all those three a try,
back-end of the three stores that Depending on your distribution, Gnome you’re better off with an appropriate Linux
depended on it as a one single entity, no Software will also display programs from distro such as KDE Neon or Kubuntu. If the
matter how many programs it could third-party repositories based on Copr in same program is available from more than
retrieve using conventional packages Fedora or PPA in Ubuntu. However, that’s one source, Discover will properly handle it
(DEBs, RPMs and so on). about it for Gnome Software, which limits and display just one program card, but will
We tried to identify extra sources of your choice to ‘your distro’s packages plus also show the Sources menu that lists the
new software that could bring us more Flatpaks’. You can add the Flathub source available installation methods.
cool stuff, and that indeed bore some and gain access to more exciting Flatpak Discover also has an integrated
fruit. Scoring more points in this test applications, but you can’t add Snap mechanism of obtaining Plasma-specific
means that a software store brings a support unless you’re running the Ubuntu- add-ons that include widgets, icons,
valid improvement over traditional flavoured version of Gnome Software. The themes and other bits from the KDE Store
package managers – not only in user latter supports both portable formats, but website. Lots of great content and mini
friendliness, but in terms of the actual it doesn’t cut it for the vanilla version of the tools can be found there, although the
value. And so we tried to uncover the store, which is a clear downside. There’s no contents from store.kde.org desperately
ways to use portable application way to manage AppImages or desktop needs moderation because it’s bloated
formats such as Flatpak, Snap and extensions in Gnome Software, either. with tons of stuff unrelated to Plasma.
AppImage, as well as seeing if it was
easy enough to enable these options in
our stores.
System upgrade capability

Can our stores upgrade not just single programs, but the whole OS?
ost software stores performed reasonably well in this system packages just fine. The Haiku OS has generally two release
M test because they rely on the mature and feature-rich

PackageKit subsystem. We tested Gnome Software under
channels: one for the current beta3 version, and another for the
‘nightly’ rolling version. You can safely use HaikuDepot to keep
Fedora, Discover under Kubuntu, and AppCenter – guess where – both version updated.
under EOS. We wanted to provide the best possible conditions for Bauh doesn’t have any system-wide upgrade features,
each store by running them in their native OS environments. although it was never meant to be used this way. It supports AUR
All three stores can handle system-wide upgrades and save and DEB packages, but it assumes that your system is a rolling
you from running any CLI commands in the terminal. However, distro that only receives ‘normal’ package updates. Therefore,
Gnome Software pushes its upgrade capabilities even further and Bauh and AppCenter don’t score many points in this test.
knows how to handle full OS upgrades. That means it can perform
an offline upgrade for switching to a newer major OS version once VERDICT
it’s available – that is, of course, if you don’t run a rolling release
Linux OS. Discover can’t manage full OS upgrades, and neither GNOME SOFTWARE 10/10 BAUH 8/10
can AppCenter. Moreover, eOS itself doesn’t support upgrading DISCOVER 9/10 HAIKUDEPOT 9/10
between major releases, so you can only install newer packages APPCENTER 9/10
as you would with apt-get . HaikuDepot is generally in the club of All five stores can keep your system updated, although only Gnome Software
upgrade-capable stores. It can search, display and install newer can handle full release upgrades.

AppCenter 5/10 Bauh 9/10 HaikuDepot 5/10

Elementary’s AppCenter is short of The concept of the Bauh store is to contain HaikuDepot is a classic-looking store that
available software. It only displays a various distribution-agnostic software supports only native Haiku package
modest subset of Flatpak apps packaged sources under one roof. As a result, Bauh repositories. You’ll soon realise that there’s
for ElementaryOS. This wasn’t the case for has more back-ends than any other store a very short list of such repos thanks to
previous versions of EOS, but the team in our Roundup. In particular, it supports limited take-up of Haiku OS itself. It isn’t
deliberately got rid of everything but Flatpaks, Snaps, AppImages, Arch HaikuDepot’s fault, but it also leaves little
Flatpaks. Therefore, AppCenter won’t do a packages, Debian packages and even web chance for it to outclass more substantial
good job when searching for popular apps desktop integration. In most cases stores from the Linux world, perhaps with
programs such as VLC or LibreOffice – something from this list is missing, but if the exception of AppCenter, which still has
they’re not in the store, although you can you hover your mouse over the question fewer programs than HaikuDepot.
still obtain them via Apt or Synaptic. mark next to the missing source, Bauh will Both the official and third-party
The good news is that you can go to the always explain why. Haiku repos have regular packages plus
Flathub web page, click the Install button Bauh was also the only app store from some ‘featured apps’ that have their own
for any program you want and have it this month’s Roundup that supported well-described cards in the store. Don’t
installed using the Sideload component of AppImages management. Many great underestimate the HaikuDepot assortment
AppCenter. It’s not obvious, but once you open source programs are provided as because it includes many popular tools
get at least one program installed via AppImages, such as Krita, and it’s always that have either been built for or ported to
Sideload, all the rest of the Flathub starts good to have a tool for registering and Haiku, including Telegram, VLC, LibreOffice
to show in AppCenter with ‘non-curated tracking such packages. Bauh works very and Krita. Haiku is the only one non UNIX-
app’ labels. It’s better than nothing, but well on any Linux system, but if you want like community-developed OS that has
the almost empty default AppCenter is it to be your comprehensive software many open source applications available
a problem that often drives away users management store, it’s best to run it on within a couple of mouse clicks from its
who want to try EOS and its ecosystem. an Arch- or Debian-based distribution. software store.
Task queueing
Can you tell your software store to batch-install new programs?
sing a software store occasionally to install just one The AppCenter store was definitely better than Gnome Software
U application is perfectly fine. However, some people prefer

more intense shopping and would like to install many
because it displayed some helpful notifications once an
application in the queue was successfully installed. There was no
software titles at once. A good store would put all such requests in extra summary about the recent queue details and status, but at
line and process them sequentially. least we knew what was installed and when. Both HaikuDepot and
It quickly turned out that Gnome Software looked very Bauh would install only one program at a time and if you wanted
uncomfortable during this particular test. It didn’t fail, since all more then you had to wait for the running task to complete. This
programs in the queue were finally installed correctly, but the effectively limits their value and makes you lose a lot of time in
store didn’t provide any feedback about what programs were case you have many applications to install.
scheduled to installed, what their progress was and what was the
result. Gnome Software definitely doesn’t want you to leave the VERDICT
product card before it’s installed. KDE’s Discover preformed much
better in that regard. After we pushed many Install buttons here GNOME SOFTWARE 6/10 BAUH 3/10
and there, we saw the ‘Tasks’ section, which expanded into the DISCOVER 10/10 HAIKUDEPOT 3/10
list of progress bars for each program being downloaded and APPCENTER 7/10
installed. As such, we were able to cancel individual downloads Our test revealed that Discover is second to none when it comes to managing
at any time while leaving the rest intact. multiple installation tasks. You have better control over what’s happening.

ROUNDUP Open source app stores
Reliability
How stable are the software stores
that you want to rely on?
o one wants a software store to misbehave, crash or
N freeze without any explanation. We generally had a good

experience with Gnome Software but occasionally it
reported ‘something went wrong’ messages. After restarting
the store they were gone.
In contrast, Plasma Discover proved to be unreliable and even
completely broken in some distributions. This store suffers from
unstable and a seemingly only partial working PackageKit
integration, therefore it’s a big hit or miss depending on what The amount of packages available in Plasma Discover is huge. However, the
Linux flavour you’re using. Plasma Discover can freeze, display only catalogue needs moderation to prevent accidental deletion of the KDE desktop.
part of the updates, or even try to update packages twice, and
that’s all rather sad. AppCenter was sleeker but we still can’t call it surprisingly stable and fail-proof. Whatever task we decided to do
stable due to numerous complaints from EOS users who suffer with it, Bauh always worked like a charm. It may be a bit slow and
frequent AppCenter glitches. The EOS community it seems lacks lacking some features, but it’s a software store you can rely on.
the manpower to polish their store and make it more stable.
Bad news for HaikuDepot here too, because this store is subject VERDICT
to sporadic lock-ups and freezes. Part of the problem originates
from Haikus itself, which has issues with networking, which in turn GNOME SOFTWARE 8/10 BAUH 10/10
causes HaikuDepot to stall. Although we liked the HaikuDepot DISCOVER 6/10 HAIKUDEPOT 6/10
design, it was the only store we had to restart every now and then. APPCENTER 7/10
And this is where Bauh, our alternative store, shines. At the Bauh and Gnome Software are the two most reliable stores in our tests. The
time of writing Bauh has the modest 0.10 version, but it is rest may work for some users, but not others.
Extra features
What else can each store do
and make you want to use it?
HaikuDepot can
oth Discover and Gnome Software support the fwupd handle OS updates
B back-end for updating firmware of your devices. Fwupd is

a software daemon that supports EFI system utilities,
because it’s a front-
end to the pkgman
utility in Haiku.
disk controllers, wireless accessories and more. See the full list at However, this store
the Linux Vendors Firmware Service (LVFS) website. It’s a great has a limited set
extra feature to have in a software store. of features.
Did we mention Plasma extensions are available right from
Discover? Extra widgets, icons, themes, decorations, wallpapers module and brings together all of these parts. Bauh also has a list
and a plenty of eye candy are available within one store! It’s a pity of ‘recommended’ web apps to help you better choose what you
Gnome Software doesn’t have anything like that. Both AppCenter want. And let’s not forget about AppImages, because Bauh is the
and Gnome Software have a similar set of features. These two only store that can carry out some integration and housekeeping
stores are aimed at simplicity and therefore don’t ship with too for apps packaged in this format.
many extras. AppCenter also handles firmware updates, shows We finally come to HaikuDepot, which is a graphical package
proprietary Nvidia drivers for those who may need them, and lists manager and a store in one tool. HaikuDepot has built-in user
details on updated components. In other words, AppCenter registration and this feature enables you to quickly get on board
enables you to quickly assess what exactly is being updated and and start writing your app reviews. This feature is very well
why, which is a good design decision. Should we call payment implemented in HaikuDepot and feels like an invitation to leave
methods integration in AppCenter an extra feature? That’s feedback that’s hard to turn down.
debatable. Other than that, AppCenter keeps things simple.
We had some great moments installing web apps with VERDICT
Bauh. That was an interesting process thanks to the automated
Nativefier feature that Bauh has to offer. Once you choose a GNOME SOFTWARE 8/10 BAUH 10/10
web app, such as WhatsApp or Netflix, Bauh fetches all other DISCOVER 8/10 HAIKUDEPOT 6/10
dependencies for turning a web site into something that looks like APPCENTER 8/10
a desktop application. It downlods Electron, NodeJS, the Nativefier ‘Native’ web apps available in Bauh is something that we’ve not seen before.

The Verdict
Open source app stores
nome Software is strong in so many areas that we
G consider it a worthy winner. It’s not ideal, of course, and

it has some problems related to usability and interaction
with its back-ends. Yet we can see that the Gnome Project dev
team has invested a lot of effort into making Gnome Software a
production-ready software store. The default store in Ubuntu
was once based on Gnome Software for a reason: it took a solid
foundation and added even more Ubuntu-specific features on
top of it. It’s a well-earned victory.
Plasma Discover is hot on the heels of Gnome Software. Our
experience with Discover varied a lot depending on the Linux
distribution that we used. Truth be told, proper integration of
Discover and a distro-specific PackageKit/AppStream subsystem
is a tricky thing that rarely goes to plan without hiccups. Apart 1st Gnome Software 10/10
from that, Discover is remarkably feature-rich and well-designed.
It was the only store that enabled us to put many installation Web: https://gitlab.gnome.org/GNOME/gnome-software
task in a queue and maintain control over it. It was more versatile Licence: GPL2/LGPL Version: 41.5
too, thanks to the fact that it supported Flatpak, Snap, Fwupd and The most mature and well-designed software store of the five on test.
Plasma extensions at a time. Nice combo!
Third place belongs to Bauh, a high-quality distro-agnostic 2nd Plasma Discover 9/10
store that you should definitely try. Bauh has several unique
features that might attract your interest. It has a clean interface Web: https://apps.kde.org/discover
that clearly shows the various package formats of the same Licence: GPL2 Version: 5.24.3
application, it knows how to wrap a web app into a desktop one, Despite some distro-specific integration issues, this is a capable store.
and it can register and take control over your fragmented
collection of downloaded AppImage files. Bauh could have 3rd Bauh 9/10
challenged for first place in this Roundup if only it didn’t lack
multi-tasking. As of now, Bauh completely locks up and doesn’t Web: https://github.com/vinifmor/bauh
even allow browsing the catalogue while another application is Licence: Zlib Version: 0.10
being installed. You’ve got to be patient in this store! The best way to organise and maintain your collection of portable apps.
Although we can’t say that ElementaryOS’s AppCenter is bad,
it’s certainly a mediocre store. It drives away users thanks to its 4th AppCenter 7/10
noticeable lack of available applications. Adding the Flathub
remote repository partly fixes this issue, but the procedure isn’t Web: https://github.com/elementary/appcenter
obvious for many newcomers. The idea of supporting developers Licence: GPL3 Version: 3.9.1
via ‘pay what you want’ donations is good, but it looks a bit out of It could have performed better if there were more programs available.
place in a store with such a modest selection of goods.
The HaikuDepot store turned out to be very laggy and 5th HaikuDepot 5/10
unstable, despite the rich selection of various open source
software packaged for Haiku. In many cases it makes more sense Web: https://github.com/haiku/haikudepotserver
to use the command line pkgman tool to avoid frequent lock-ups Licence: MIT Version: 1.0.129
of the official market application. Looks promising, but suffers from performance and reliability issues.
ALSO CONSIDER
We deliberately excluded various flavours and rip-offs of the is a matter of one or two commands to be copied and pasted
popular Gnome Software store. Ubuntu has its own version, to your terminal, so maybe there’s no need in a separate GUI?
which can be configured to use Snap packages, while Nevertheless, there are many lesser-known app stores for
System76 still relies on their own AppCenter fork known as Linux that we haven’t covered here. How about Souk, a Flatpak-
Pop!_Shop. All those forks are interconnected and generally only store written in GTK4 and Rust? Or maybe the Flutter-
have minor differences. If you still miss Snap support, take a based AppImage Pool that’s designed exclusively for that
look at the Snapcraft web store, which is perfect for browsing package format? There’s always a choice, so go ahead and
and discovering apps. Once you decide to install something, it find the best store for your needs and tastes.

BULLET-PROOF
UBUNTU 22.O4
Walpurgis Night is nearly upon us, so cast aside your old OS
and begin life anew with Ubuntu 22.04, says Jonni Bidwell.
ighteen years ago Canonical, communication is now carried out by is back with a brand-new release called
E led by dot-com magnate-

cum-space tourist Mark
Shuttleworth, unleashed the
smartphones (some of which run Linux,
but not ‘real’ Linux). Desktop Linux is alive
and well, but the ecosystem is still not
Jammy Jellyfish. It incorporates parts of
the latest Gnome 42 desktop. The switch
to the Wayland display protocol has finally
first Ubuntu release. It was nothing short perfect. An abundance of desktop choices, happened. The new Pipewire multimedia
of revolutionary. Suddenly Linux was a together with numerous forks of popular framework is woven into its fabric. And it’s
thing for human beings. Networking distros, have led to complaints about a Long Term Support (LTS) release, so you
worked out of the box, as did a glorious fragmentation (from people that don’t can keep on using it for five whole years.
– albeit brown – Gnome 2 desktop. It understand open source software and You won’t find earth
was built on Debian and inherited that free will). And Canonical copped plenty shattering user-facing
reputation of stability, but it wasn’t of flack when it abandoned Unity and changes here, but you
Debian. It was something special. the Ubuntu Phone. will find a great,
A huge community rallied around But it’s not all bad. Companies reliable OS. Read on
Canonical, which promised that it would have embraced Linux, in to find out why…
listen. A bespoke bugtracker named particular Valve. Its work on
Launchpad was set up, and the first bug Proton has enabled some 5,000
filed was “Microsoft has a majority market Windows-only games to be
share”. For many, Linux’s golden age was played on Linux. And Ubuntu
about to begin, and there was a palpable is still a hugely popular
sense that Bug #1 would soon be fixed. Linux distribution that’s
Flash forward to today, and you’ll see great for playing said
that not all of those dreams came true. games, wrangling
Windows still rules the desktop (though vital documents,
MacOS and ChromeOS are swallowing or managing
that up). Casual desktop computing as a your clouds.
whole is becoming a niche hobby, because And now
a great deal of our browsing and Canonical

Bullet-proof Ubuntu 22.04
Of jams and jellies

It’s Ubuntu LTS time, so let’s see what will be
the shape of Ubuntu for the next few years…
e always look forward to trying out a new
W Ubuntu release. But this time around we’re

not expecting a wildly reinvented desktop
paradigm or huge performance leaps. The previous
Ubuntu LTS, Focal Fossa, after occasionally rocky
beginnings, has been a loyal servant to many of our
machines, and we’re sure Jammy Jellyfish will be a
worthy successor. We’re looking forward to Gnome
CREDIT: @simonjbutcher
42 (although there are some loose ends from earlier
releases), a more polished Wayland experience and
we want to see how Canonical is pushing ahead with
its Snap initiative.
There’s only one problem. At time of writing, it hasn’t
been released. But that’s okay, because it will be by the
time you read this. And if we’re lucky there we won’t
have missed any last-minute additions or surprises. Ubuntu uses Wayland and (maybe) remember that The official
We’ve been testing the daily Jammy Jellyfish images for Active Directory can be set up from the installer. You’ll background is over
the page, but these
a couple of months prior to the official release. be aware that there’s light and dark versions of the Yaru
AI-generated
theme, and you’ll suspect (rightly) that these have been jellyfish by Simon
Minor niggles, begone! further tweaked. To be frank, if you’ve been using Butcher are
And we’ve seen quite a bit of change in that time, Ubuntu 21.10, then there’s not anything ground- something else.
particularly as parts of the recently released Gnome 42 breaking in 22.04. But that doesn’t mean you shouldn’t
start to find their way in. Indeed, as we write this we’re upgrade. You should, because if nothing else your
still about a week away from launch day, but since both interim release is about to be EOLd. Oh, and if you’re of
the Feature and UI Freeze have passed we don’t expect the ilk that gets excited by phrases like ‘modern design
any drastic changes. We do rather hope some minor trends’, then check out the new logo. It’s similar to the
niggles (such as stuttering and occasional crashes old Circle of Friends logo, but on a web3-friendly (stop
while dragging windows between monitors) get sorted baiting sensible readers! – Ed) rectangular background.
out, though. If you just want to see what Ubuntu is like, there’s no
If you’ve used either of the interim releases (21.04 or need to install it at all. Just follow our handy three-step
21.10) since the lasts LTS then you’ll be aware that now guide to downloading, writing and booting an Ubuntu
USB stick, or DVD (Sorry!–Ed) if you must.
DOWNLOAD AND BOOT UBUNTU
Download an ISO Write out a USB stick Boot Ubuntu

1 Go to https://ubuntu.com/ 2 Use your favourite image writer (or 3 Your machine might enable you to
desktop and download the ISO file. It’s download Balena Etcher from https:// bring up a boot menu by pressing F12 or
3.5GB so you may want to fetch a cup of etcher.io) to write the image to a USB F10 at boot time. If so use this to one-time
tea. If you’re interested in trying another stick. Don’t remove the medium until boot from the Ubuntu medium. Otherwise
flavour, such as Kubuntu or Lubuntu, you’re told it’s safe to do so. Bad media will you’ll need to go into the UEFI/BIOS setup
you’ll find links at https://ubuntu.com/ cause problems later. You could also (using interface and change the boot order. See
download/flavours. You’ll also find links to different software) make a DVD, but this the official docs at https://ubuntu.com/
the Server, Pi and Core editions here. will be slower than using flash media. tutorials/try-ubuntu-before-you-install.

Escape Windows
Whether you’re a complete novice or Windows has driven
you to seek out other operating systems, Ubuntu can help.
indows 11 has been rolled out through the to be sure Windows won’t touch your Linux: unplug the
W Insider program since late last year. All

Windows 10 users will have been offered the
SSD prior to booting to Windows. Yup, it’s hard to
remember and potentially awkward to carry out (if your
upgrade, in all likelihood, by the time you’re reading case is under the desk, say), but at least you can
this. There’s nothing like a new Windows release for describe your install as ‘airgapped from Windows’.
motivating people to switch to Linux. So here’s a You might instead want to install Ubuntu to an
quick guide for recent Windows apostates. external hard drive or USB stick, though if you’re not
You may be tempted to dual-boot Windows and using USB3 storage this won’t be terribly performant.
Ubuntu together. This might sound convenient, but it’s Ideally, you’d put it on a whole new machine, but not
rich with pitfalls so not something to rush into. Ubuntu everyone has a spare, working machine.
will install alongside Windows, but there’s no telling if
down the line Windows Update will, on a whim, decide BIOS, meet UEFI
the Linux partition(s) is no longer necessary. For this Modern PCs use a newer firmware, the Universal
reason we don’t recommend installing both OSes to the Extensible Firmware Interface, rather than the
same device. A 250GB SSD is ideal for your first Linux traditional BIOS of yore. UEFI machines may have a
explorations, and you can get this new for around £25. classic BIOS emulation mode, but you almost certainly
Our next prudent bit of guidance is perhaps overly shouldn’t enable it. Especially if you already have OSes
cautions, and a little inconvenient, but it’s the only way installed in UEFI mode (they will stop working).
Get to know Ubuntu’s Gnome desktop

1 6 5
4
2
Activities Applications grid Status icons

1 Click here or press Super (Windows) to 3 This displays all currently installed 5 Network, volume and power indicators.
bring up the Activities Overview. This will show applications. Type a few characters to narrow Click to access Bluetooth, brightness and (for
you previews of open windows, which you can down the list. You can also find emoji this way, laptops) power profile settings. The logout and
drag over to the right, to move them to a new if they float your boat. Oh, and there’s a virtual shutdown options are also here.
virtual desktop desktop switcher here too.
Notification area:
Dock Desktop options 6 Alerts, such as new software being
2 This provides easy access to popular 4 Right-click to change either the available or new media that’s being played,
programs. Running applications are indicated background or display settings. You can also are shown here. There’s a calendar too – this
by a red dot. Right-click to pin or unpin create desktop folders. can either be used locally or connected with a
applications from here. cloud service.

Note that PCs these days can be

incredibly fussy about getting into
the UEFI setup or summoning a
boot menu. Precision timing,
multiple reboots, as well as digging
up manuals to find the appropriate
shortcut key may be required. The
Ubuntu EFI boot capsules are all
signed by a Microsoft-endorsed key,
so there should be no need to
disable Secure Boot.
One thing to be aware of is that
one EFI partition is required to boot
a UEFI system. So if you plan on
installing Ubuntu on a separate
drive, make sure the “Device for
bootloader installation” is set to the
original drive, and that the EFI
partition is selected. This drive will need to be plugged in the left-hand side is a nod to Ubuntu’s old Unity Don’t know what
to boot either OS, but you’ll be able to choose which desktop. The new desktop has been based on Gnome 3 to install first?
Let the Snap
from the UEFI. since Ubuntu 18.04, but with some usability tweaks.
Store inspire you.
Once you’ve successfully booted Ubuntu, you’ll be Gnome 3 was seen by some as too ambitious, And don’t forget
asked whether you want to try Ubuntu or jump right in occasionally buggy, and a memory hog when it was your updates!
and install it. We’d suggest trying it first, if you haven’t introduced in 2008 (this commentator even used the
already. This enables you to get a feel for the operating phrase “hypermodern”), but these days the fact it forms
system without it touching any of your storage. So you the basis for so many desktops is testament to its
can try out bundled software, install new things and see solidity. If you imagine the dock was gone you’ll see
if it’s right for you. The only downside is that it won’t what a lot of traditionalists’ main problem with Gnome
quite be as performant as the real thing. Oh, and any
USING A ROCK-SOLID GNOME

changes you make will be lost after a reboot, of course.
The annotation (below left) shows you the rudiments of
“The new desktop has been based

Ubuntu’s Gnome desktop.
Just as in other OSes you’ll find folders for your
on Gnome 3 since Ubuntu 18.04,

Documents, Photos and Downloads. But unlike at least
one other OS you won’t be bombarded with marketing
but with some usability tweaks.”

or voice assistants trying to help you. The Dock area on
is: There’s no obvious menu to launch applications. The

applications grid provided by the Dock isn’t quite the
same thing, but if you’re in the habit of using a mouse to
open a traditionally placed applications menu, then your
muscle memory will more likely bring you here than to
the Activities view.
On a clean install the dock area has shortcuts to
Firefox, Thunderbird and LibreOffice Writer. The question
mark icon will take you to the desktop guide, which
hopefully answers any questions you may have. You’ll
also find links to Ubuntu Software (the shopping bag
icon), in case you want to install more software, as well
as the venerable Rhythmbox music player. Internal and
external drives will also show up here, plus there is a
If you know what you want, partition-wise, then the Something Else Rubbish Bin from whence deleted files can be retrieved.
option in the installer will help.
BECOME A KEYBOARD WARRIOR

In an age of QHD screens and 4K key to bring up the Activities view, your Super+PgUp/PgDown switch virtual
displays, the mouse cursor’s pilgrimage life in Gnome may be improved (May? – desktops
to the top-left corner can be an arduous Ed) with the following knowledge: Shift+Super+PgUp/PgDown move
one. This journey can be saved through Ctrl+Super Left/right tile window window to prev/next workspace
the magic of keyboard shortcuts. Apart left/right Shift+Super Left/Right move active
from the all-important Super (Windows) Super+A show applications grid window to prev/next display

Customise Ubuntu
Discover new software. Change settings. Install a new desktop (or three).
buntu (and most other desktop Linux never heard of. You will, however, find the official Spotify
U flavours) have been designed to be intuitive

and easy to learn. However, sooner or later
and Audible programs, as well as unofficial players for
Deezer, YouTube, Google Play Music and Apple Music. If
you’ll probably want to change some things around. you prefer something even more nostalgic, you’ll also
For example, we think Rhythmbox is great. It’s been find Foobar2000, DeaDBeef-vs (a minimal GTK player
the default music player in Ubuntu since the very and glorious hex reference) as well as myriad text-based
beginning (with only a brief sabbatical while Banshee music players. Install Spotify (or whatever else takes
took its place in 2011). But with its Client Side your fancy) by hitting the green button.
Decorated window it looks dated, and can’t connect Most applications in the Software application are
to popular (albeit proprietary) streaming services so shipped as Snap packages. You can see the delivery
we might want to look at alternatives. By this point mechanism in the Source box in the top-right. Snap is
we’re assuming you’ve installed Ubuntu, and enjoyed Canonical’s self-contained packaging format which (like
its new look Flutter-built installer. Flatpak, which is a similar effort) enables developers
Fire up the Ubuntu Software application, scroll down to easily ship software without having to worry about
to the list of categories and select Music and Audio. You’ll distro-specific packaging and which versions of which
see a selection of audio programs, most of which we’ve libraries to ship. Snaps also run in a confined sandbox
(unless you give them permission to otherwise) so they
can’t access any files or hardware they don’t need to.
DESKTOP CHOICES
Life on the bleeding edge
There are multiple flavours of Ubuntu 22.04 that include the same Occasionally in the Source box you’ll see a variety of
rock-solid foundation as the flagship, but with a different desktop different ‘channels’ are available for a given Snap. These
environment. If you like Ubuntu but don’t like modern Gnome, then often enable you to grab a beta or development release,
Kubuntu, Ubuntu MATE (inspired by Gnome 2) or the lightweight in case you want to live on the bleeding edge. System
LXQt-powered Lubuntu are well worth your time. But rather than packages are still installed as .deb packages and there
install a whole new *buntu, you might prefer to just add a new are still tens of thousands of these traditional packages
desktop to the current installation. This is unlikely to break anything, you can install from the command line with Apt. These
but the session packages we’ll install include each desktop’s core no longer show up in the Software application, but if you
applications. So you might end up with two (or more) file managers, install Synaptic you can browse these graphically.
text editors and the like. Canonical has put a lot of effort into making sure
Some desktops come with their own login manager too. So for popular applications are available in Snap form. Besides
example if you install the kubuntu-desktop package you’ll be asked if Spotify you’ll find Telegram, Slack, Blender, GIMP and the
you want to stick with Gnome’s GDM3 or switch to SDDM (which is PyCharm development environment for Python. There’s
built using Qt so looks more KDE-like). There’s no right or wrong also open source versions of some classic games,
answer, and you can change your mind with sudo dpkg-reconfigure including Prince of Persia (SDLPoP), Open Jedi Knight
gdm3 . The other desktop packages are named similarly, so there’s and Widelands (a Settlers clone).
ubuntu-mate-desktop and xubuntu-desktop. Most of these have a
more slimmed-down version – for example, kubuntu-core will install a
more minimal set of applications.
Installing the whole Kubuntu desktop package makes for a menu that, unsurprisingly, An ad-blocker and Mozilla’s container programs are essential for the
is rich in items that begin with K. modern Web. And switching the default search to DuckDuckGo.

about Gnome extensions, since it gives you a whole

other avenue (and tool) by which more software can be
accessed. So open a terminal and run:
$ sudo apt install flatpak gnome-software-plugin-
flatpak gnome-software
$ sudo flatpak remote-add --if-not-exists flathub
https://flathub.org/repo/flathub.flatpakrepo
This add support for Flatpak programs in the Gnome
Software GUI, also installed by the first command. So
you’ll be able to search for Extension Manager there
after a reboot. Note that Gnome Software is distinct from
What’s up, dock? Here we’ve put the Dock at the bottom, removed the usual Ubuntu Software tool. It’s just called Software
various clutter, and made it shorter. and has a shopping bag icon. Alternatively, if you’re
enjoying the terminal the required incantation for
A big change in this Ubuntu outing is that Firefox is installing and running (sans need to reboot) is:
only available as a Snap. This comes directly from $ flatpak install com.mattjakeman.ExtensionManager
Mozilla, saving Canonical a packaging burden (and $ flatpak run com.mattjakeman.ExtensionManager
forcing derivatives such as Linux Mint to build and You’ll see that Ubuntu uses three Gnome extensions
package their own Firefox). In our testing, there was a (for desktop icons, appindicators and the dock) and that
delay of about 10s each time Firefox was started from two of these can be configured. And if you navigate to
a clean login. This is mildly annoying since the web the Browse tab you can find many more. You might
browser is often the first thing one opens post-login, but already have some favourite Gnome extensions,
hopefully Snap startup times will be worked on in future. and hopefully most of those have been updated to
If the slow-starting Firefox (or Snaps in general) support version 42. Extensions Manager will display
bother you, then you can always use the Mozilla PPA to “Unsupported” if not. The popular “Blur my Shell” is
install a traditional package (see https://launchpad. available. Likewise GSConnect, a Gnome-centric take on
net/~mozillateam/+archive/ubuntu/ppa). Or download the popular KDE Connect utility for talking to your phone
a tarball from its FTP site. Or you could switch to the from the desktop.
other side of the modern packaging formats debate and The shortcut bar on the left isn’t to everyone’s taste,
install Flatpak and Firefox from the Flathub. Your first act although fans claim it is more efficient than having it
will likely be to install uBlock Origin, as well as Mozilla’s along the bottom. You might prefer to get rid of it
Facebook Container and Multi-account Container add-ons. altogether and make the desktop more like the
Back in LXF283 we looked at how Firefox worked on vanilla Gnome you’d find in the likes of Fedora.
Ubuntu 21.10 (and Fedora 35), and found that the Snap Wherever you want your dock, it can be
version didn’t work at all with VA-API video acceleration. configured by starting the Settings application
Happily, we were able to get it working in the new (either from the menu at the top-right or from
version, though some extra configuration is required. Go the Activities Overview) and navigating to the
to about:config (noting the warning) and set media. Appearance section.
ffmpeg.vaapi.enabled to true. Later you may also want The screenshot shows a slightly more
to set media.navigator.mediadatadecoder_vpx_enabled orthodox arrangement, except there doesn’t
as well, which will accelerate WebRTC (for example, seem to be a way to move the Applications Grid
Zoom, Teams, Jitsi) sessions. In our testing (in Firefox 98, shortcut to the left, which is where traditionalists
99 and 100 by way of Snap channels) we had to disable might prefer to find the thing which most closely
the RDD sandbox to make it work. Since this is a security resembles a classical application menu. The new Dark
risk we won’t tell you how to do it here (but we’re sure Theme (which now should work universally) can also be
you can DuckDuckGo it). enabled from the Appearance section.
In that feature we also saw that both Snap and
Flatpak versions of Firefox (and Chromium and Edge)
can’t handle extensions which use Native Messaging.
This is still true, so password manager extensions (as
well as things like hardware authentication tokens) don’t
currently work here. Both packaging formats should
soon see a host messaging portal soon, but until then
these add-ons will only work with traditionally packaged
browsers. On a related tangent, KeePassXC installed as a
Snap (or Flatpak) will integrate with such browsers, but
you’ll need to run a script, as described on its website.
Another consequence of contained browsers is that
the old https://extensions.gnome.org (EGO) website
won’t work correctly. Even if you install chrome-gnome- Ubuntu can make
shell and the browser plugin. That’s okay though, for your various
workspaces work
now you can use a third-party tool, such as Extension how you want
Manager, to do this. This tool is available as a Flatpak, so them to across
we’ll need to install that and set up the FlatHub repo multiple monitors.
first. You might want to do this even if you don’t care

Tweaking and rewiring

Some final edits to perfect your installation, plus a little Ubuntu nostalgia.
ayland by default was tested in Ubuntu 17.10, headsets), you can install the PipeWire session with
W but that was perhaps a little ambitious. Now

the technology has matured and Canonical
$ sudo apt install pipewire-pulse . Then if you log out
and back in and run the command:
is confident that it’s – to dredge up an irksome $ pactl info
phrase – “ready for prime time”. Extensive testing has you should see (among other lines):
taken place and the team are confident that the Server Name: PulseAudio (on PipeWire 0.3.xx)
Wayland experience will be good for all. Yep, even Additional libraries may be required for some
those using Nvidia hardware. If it’s not, well, that’s Bluetooth audio codecs. Try:
fine. The old X11 session is still there. $ sudo apt install libfdk-aac2 libldacbt-{abr,enc}2
Wayland has been fairly misrepresented in the libopenaptx0
press, (who, me?–Ed) historically. The most egregious if you run into difficulties. Alternatively, seek more
falsehoods were that remote desktop sessions, screen up-to-date documentation, we are unfortunately static!
sharing and even humble screenshotting are impossible Ubuntu has used Gnome as its default desktop
with Wayland. Do not believe such myths. The problem since 18.04 LTS. If you pine for the Unity desktop,
wasn’t Wayland, it was programs that didn’t support it. then you might be interested in the Extended Security
All the screenshots in this feature would not be here if Maintenance (ESM) that’s available for the previous
that were the case. LTS, Ubuntu 16.04 (Xenial Xerus). The official support
period for this expired in May 2021, but since this
WE’RE IN GNOME’S GOLDEN AGE

version is still widely deployed Canonical offers paid-for
support to organisations. This is achieved through its
“The stutters and memory leaks that

Ubuntu Advantage for Infrastructure program. Personal
users are allowed ESM on up to three machines for free,
dogged Ubuntu Gnome’s performance

so if you want to keep the Xerus alive you can now do so
in a safe and (semi) supported manner.
for so long are well and truly gone.”

We were feeling nostalgic, so we fired up Ubuntu
16.04 on our XPS. This hadn’t been booted for some
time, and had problems seeing our new-fangled USB-C
One change mulled for 22.04 but which in the end dock (or the network cable plugged therein). But once
never made it is the replacement of PulseAudio with we’d updated it, enrolled the machine in Ubuntu
PipeWire. The latter is a whole new multimedia Advantage and updated again everything worked more
framework which, as it happens, enables desktop or less fine. Don’t let anyone tell you nostalgia is not a
sharing and screen recording on Wayland. Programs good reason for running old software. Especially when
may still depend on PipeWire (particularly web you’re entitled to run three instances for your own
browsers), but venerable PulseAudio remains the pleasure. If you were looking for actual phone and ticket
default sound server. If you want to change this (for support, then this starts at $150/year for a single
example, if you’re having difficulty with Bluetooth desktop installation or $750/year for a server.
It’s not really intended to help beginners get
their printers or Wi-Fi working. Ask nicely on
https://ubuntuforums.org or https://
askubuntu.com for that sort of support.
Booting back into the new release
was much quicker and smoother by
comparison, which to be honest you’d
expect after six years of UI
development. This release
might not have the kind
ground-breaking features
that we used to enjoy, but
that’s probably a good
thing. All those features
and breaking changes
we used to love five to
15-years ago were a
consequence of desktop
One thing that was quite hard to screenshot (but for once not because of Wayland) was the Linux still being rather
new screenshot tool. Oh the irony! new. Now that Ubuntu’s

desktop is established, like it or not,

it doesn’t make sense to go
changing it. Instead, we should take
comfort in the fact that after four
years of using Gnome for its flagship
desktop, the experience is now
second to none. The stutters and
memory leaks that dogged Ubuntu
Gnome’s performance for so long
are well and truly gone.
A common Theme
Gnome themes have come under
the spotlight since the introduction
of GTK4 (inaugurated with Gnome
40). Did we say themes? Ah, we
meant theme, because custom
theming of Gnome applications is
now verboten. The default GTK3
theme was called Adwaita, a
Sanskrit word often translated as ‘the only one’, (literally The old Gnome Tweaks tool is still available in the Menus in titlebars.
Amazon search
‘not two’). But it wasn’t really the only one, because repo, but like the EGO website it can no longer manage results in the HUD.
developers could happily write their own CSS stylings. Gnome extensions. That’s okay, because it can do most Ubuntu 16.04 had
In GTK4 this theme has been promoted to a platform everything else, including cleaning up the mess our some crazy ideas!
library, libadwaita, which Gnome developers say will Gnome fonts ended up in post installation of KDE
guarantee conformance with their Human Interface Plasma. Tweaks also enables you to manage startup
Guidelines. And (like the characters often say in programs, change titlebar button visibility (or move
Highlander) there can be only one. GTK3 applications them to the left, MacOS style) and adjust legacy
will still respect custom themes, but GTK4 ones will only theming. You can install Tweaks with:
support the limited changes (for example, background $ sudo apt install gnome-tweaks
and accent colours) permitted by libadwaita. This will install a different Extensions tool, currently
For Ubuntu 22.04 this might be bad news, because in beta form. At the time of writing this doesn’t let you
at present it uses a mix of Gnome 42 applications install new extensions, otherwise we could do away with
(libadwaita-based) plus some from older releases (such the previous tool. For even more tweakability, try Just
as Files, which is based on GTK3 and libhandy). This Perfection, found in Extension Manager. It allows for
may change prior to release, otherwise there are going parts of the shell theme to be overruled (including
to be some cosmetic inconsistencies. If this bothers removal of the top bar) to make matters more minimal.
you, then you might want to run away from Gnome 42 We don’t go for Gnome extensions ourselves (despite
for the next little while, in which case there are some having two programs for managing them), let us know
suggestions in the box (see below). what we’re missing out on. Enjoy Ubuntu 22.04!
LOOKING ELSEWHERE?
Latterly there seems to have been a bit offer something which is hard to We’re excited to see more people
of a trend for Linux-leaning social media recreate on Ubuntu Linux, but ultimately trying Fedora. It’s now more accessible,
channels to announce they’re “no longer distros that depend on its packages, particularly as regards installing non-free
recommending Ubuntu” or other such infrastructure and documentation. software. Together with its rapid release
things. Reasons are varied, we suppose, Until now, perhaps. cycle this makes it a great platform for
but the triumvirate of Snaps, Wayland Mint’s latest Debian Edition (LMDE5) gaming. Well worth checking out if
and Gnome don’t seem to be to is rapidly gaining traction. Pop!_OS has Ubuntu is no longer serving you.
everyone’s taste. moved its PPA repositories away from
We’d still heartily recommend Ubuntu LaunchPad and is working on a new
to anyone, beginner or otherwise – as it Rust-powered desktop environment
“just works”. Even if you don’t like it, as (with a view to moving away from
we’ve seen it can be customised, Gnome). And Elementary OS has had its
extended or otherwise bashed around to own app store for ages and has likewise
your taste. Lots of the distros these sided with Flatpaks over Snaps. In sum,
channels recommend in Ubuntu’s stead if Ubuntu doesn’t do it for you, there are
are themselves based on Ubuntu – for plenty of derivatives you can switch to
example Linux Mint, Pop!_OS and without having to learn a whole new way Fedoras and the distribution of that name are all
Elementary OS. All great distros that of working. the rage right now.

Pi USER
Matt Holder
has worked in IT for Consumers last in the
queue for Pi resupplies
15 years, with 13
years’ experience
in supporting
IT in schools.
BITTEN BY After warnings early in 2022, stock remains a

THE FOSS BUG challenge for the Raspberry Pi Foundation.
Ever since my teenage years I’ve espite baking half a million Raspberry commercial and industrial customers – the
had an interest in programming
and electronics. Many hours were
D Pi devices per month, demand is still
outstripping supply and Raspberry Pi
people who need Raspberry Pis to run their
businesses – we’re acutely aware that
spent sat next to my dad, learning co-founder Eben Upton has taken to the people’s livelihoods are at stake.” It remains
how to program in QBasic. I then company’s blog (https://bit.ly/lxf289pi) to the case that newer 28nm models – Pi
happened upon a book, which talk about the continuing product shortages, 4-based options – are easier to source than
showed how to use a parallel port and how it will be addressing the difficulty in older 40m products such as the Pi 3.
to interface with the outside purchasing new models. Commercial and Due to market scalpers many stores now
world. Dad and I spent many industrial customers will get priority, leaving limit the number customers can buy and offer
more hours devising a timing individual customer’s struggling to buy two-factor authentication to limit or stop bots
system that could be used to Raspberry Pi for their own home projects. from auto-trading on scarce stock. Eben
time cars as they hurtled around Eben urges people to buy from an added, “Many Approved Resellers have
my Scalextric track. Following approved reseller, because they’re getting implemented single-unit limits to combat
this, I carried on developing priority to stock, but does add, “Right now we this… we’re encouraging other Approved
various electronic circuits. feel the right thing to do is to prioritise Resellers to consider this route”.
I was bitten by the Linux bug Eben advises that the Pi Pico and Pi 400
two decades ago now. I can still are generally in stock, while you can use
remember being sat in a fast food https://rpilocator.com to locate stock, too.
restaurant, with the yellow logo
with a friend of mine, during One Pi at a time, move along
college free periods. My friend please, form an orderly queue.
would talk excitedly about the CREDIT: Raspberry Pi Foundation
culture surrounding free software
Arm powered It’s another SBC

and why more eyes on the code
is a good thing as well as the
technicalities, which, at the
time, went over my head.
Then I installed Slackware at Not that sort! New Portenta X8 board.
home, where I learned about the
distribution, SSH, kernel options, Arduino has released a robotic-arm tool that’s Coming in at approximately the same size as
enabling routing as well as many powered by its own Nano RP2040 Connect a Raspberry Pi Zero, Arduino’s new single-
other technical things. chip. The Braccio++ costs $600 and has been board computer X8 contains a quad-core
I couldn’t have been happier designed for engineering-level classes. The ARM Cortex-A53 processor running at up to
when the Raspberry Pi was arm is made from recycled food cartons with 1.8GHz, an additional Arm Cortex-M4 core up
announced. The combination an aluminium layer for strength. It’s powered to 400MHz, 2GB of RAM and 16GB of eMMC
of an amazing community, by six Arduino RS485 Smart Servo Motors: storage with a full suite of comms. With this
readily available and cost- four in the arm and two to control the claw. SBC Arduino’s 199 Euro device is aiming to
effective peripherals and support See https://store-usa. take on the Pi Compute. Find out more at
for multiple programming arduino.cc/pages/ https://store.arduino.cc.
languages has turned this braccioplusplus
amazing little board into a for more details.
world- conquering device!
At home I have Raspberry Pi
CREDIT: Arduino
Zeroes acting as baby monitors

and temperature sensors for the
kids’ rooms that report back to
Home Assistant, which is itself
running on a Raspberry Pi 4,
booted from a USB SSD. Armed to At least you can
the teeth. buy this one!
CREDIT: Arduino

Armbian 22.02
Jammy XFCE
Les Pounder takes a look at a distro that supports 64 different
Linux single board computers, and now he has to buy them all.
rmbian is a Debian-based distro designed as a
IN BRIEF
Armbian is a
A framework for many models of single board
computers (SBCs). Armbian is available for 64
framework from different SBC, some of which we’ve never heard of. No
which we can matter which SBC we chose, they all claimed to be
create our own lightweight, fast and secure. So with these bold claims in
distros for a mind, we fired up our trusty Raspberry Pi 4 for a test.
plethora of We chose the latest Armbian desktop release, Armbian
Linux SBC. 22.02 Jammy XFCE, which is based on Ubuntu 22.04
Supported by “Jammy Jellyfish” and uses the XFCE desktop
64 different environment. There’s another CLI release that provides
Linux devices, the bare minimum for a build. We tested Armbian on a As ever, YouTube playback on the Raspberry Pi 4 is bad. The best we
Armbian is a 2GB Raspberry Pi 4 running at stock speed, which is will get with 720p60 video is a slight stutter.
solid, no-frills 1.8GHz on our Pi because we have a later revision of the
distro that acts BCM2711 System on Chip (SoC). After updating the software repositories we set to
as a blank The boot sequence is typical Linux: just lots of text testing Armbian and because this is a Pi we wanted to test
canvas for our scrolling up the screen as the services and device drivers the GPIO. This is where we hit a problem. Raspberry Pi OS
projects. GPIO are loaded into RAM. The first boot sees a short users will be familiar with RPi.GPIO, PiGPIO pin factories,
support is interactive sequence where we create a root password, an but Ubuntu uses lgpio, which talks to Linux gpiochip
minimal and unprivileged user and a choice of shell: Bash or zsh. We devices and isn’t specific to the Raspberry Pi (remember,
streaming video chose the former. After a few moments the desktop Armbian covers 64 SBCs). Using lgpio with Python 3 we
is a slideshow, appeared and we saw the familiar XFCE desktop. Armbian can flash an LED, make connections with I2C devices and
but we get a comes fully loaded. There’s a web browser (Firefox) , a PWM. But for HATs and other add-ons that require
rock-solid base choice of terminal emulators (including Terminator, an old specific Python modules your mileage will vary. We used
to build from. favourite of ours), LibreOffice and typical desktop tools. our default test HAT – Pimoroni’s Explorer HAT Pro –
We ran a quick test of Big Buck Bunny, initially which uses a mix of I2C, PWM and digital IO, and this is
streaming the 1080p60 version that became a slideshow where things went wrong. The automated install script
as frames were dropped. Dropping the resolution to failed with multiple errors that we remedied, but Explorer
720p60 and it was a little better, 480p was great. This HAT’s dependence on RPi.GPIO killed our attempts.
issue isn’t linked to Armbian; even Raspberry Pi OS finds Don’t be put off by Armbian. It’s a solid base for
1080p60 a challenge. The desktop is rather utilitarian, but projects that don’t require the GPIO. Your embedded
that’s part of the charm. Armbian isn’t Raspberry Pi OS. systems will benefit from the stability. Build a server,
A simple, desktop Sure, we can use it as a desktop computer, and Firefox is appliance or kiosk with Armbian and you can port your OS
environment responsive enough even on our 2GB Pi4. We also did a to another SBC, and given the global chip shortage, this is
affords us a blank quick test of a 1GB Raspberry Pi 4, and the experience becoming more of a necessity than an option.
canvas from which
we can create
was less than stellar, with a lockup forcing us to reboot. A
our own custom
distributions.
2GB Pi should be the lowest spec to consider for the
desktop OS. CLI users should be fine with 1GB of RAM.
VERDICT
DEVELOPER: Armbian Team
WEB: www.armbian.com
LICENCE: GPL v2

PERFORMANCE 7/10 DOCUMENTATION 8/10
A solid framework for those wanting to make their own SBC

distros. Not for the everyday Pi user, but a nice alternative.
Rating 7/10

Raspberry Pi camera REVIEWS
Arducam Auto-focus
16MP Camera module
Quick-off-the-draw Les Pounder can’t shoot shots faster than this camera.
rducam’s latest crowdfunded camera features
SPEC
Sensor:
A the familiar official Raspberry Pi camera form
factor, but with an autofocus lens and a sensor:
Sony IMX519 Sony’s IMX519. This is even more powerful than the one
Optics: used in the official Raspberry Pi HQ camera.
Type 1/2.53 The case for the camera is sold separately, but if you
Sensor: can spare the extra £4.50 you’ll discover that it features a
4,656x3,496, 1/4-inch thread for tripods. The included CSI flat flex cable
16MP is the same as the one used with the official Pi cameras,
The Arducam is size-
Video: and it can be changed for either longer or shorter cables, compatible to the
1080p30, or used with converters if the Raspberry Pi Zero is your official Pi cameras.
720p60 device of choice.
F-stop: As you would expect from a Raspberry Pi camera, The same can’t be said for raspistill, raspicam and
1.75 the unit connects to the Camera (CSI) port alongside the PiCamera. They just don’t work with this camera, and
Focal length: HDMI port. In order for the camera to work, we need to that’s a real shame. Apparently a fix is in the works…
4.28mm follow a few simple steps to download and install a driver Arducam’s camera has much better focus than the
Focus: and then a tweaked version of libcamera. This has since fixed focus official V1 and V2 cameras, which have a 1-2m
10cm to infinity become the standard camera software on Bullseye, the to infinity focus range. So anything greater than 1-2m is
Size: latest Raspberry Pi operating system. sharp, but close up we get a blurred mess (unless you
26x24x18mm hack the lens). With Arducam and its autofocus we have a
Manually operated autofocus focal range between 10cm and infinity.
With the installation complete, we carried out a few During our comparison tests, we noticed an
tests, beginning with the “Hello World” test using unfortunate side-effect of installing the Arducam
libcamera-hello. We secured our camera into a tripod, software: it broke compatibility with the official Raspberry
pointed it at a suitable test subject, and saw that the Pi cameras. We tested our Bullseye and Buster test
image wasn’t focused. It transpires that the camera installations, both of which were running Arducam’s
focuses when the libcamera command is invoked with software, and sadly our official Raspberry Pi HQ camera
the --autofocus switch and it doesn’t constantly “hunt” wasn’t detected. There was a simple workaround, with an
or change focus as objects move around the frame. official fix out by the time you read this, so we’re told.
To refocus the camera we need to use an additional If you need the quality of the HQ camera and the size
switch: --keypress . Using this command we can arrange of the V1 and V2 official cameras, then Arducam High-
the subject to be captured, then switch to the terminal Resolution Auto-focus Camera is for you. The size and
window and press f then Enter to refocus the camera. shape of the camera mean that it can be a drop-in
Out of the box Raspberry Pi OS Buster couldn’t detect replacement for bird cams, wildlife trails and openCV
the camera and these commands fail. The same is true robotics projects. Autofocus, the key selling point, is great
with the popular Python PiCamera library. We performed and while it may not constantly set the autofocus, focus
the same install process as we did with Bullseye and time is fast. In fact we accidentally took a focused image
libcamera detected and used the camera with no issues. in 1/100th of a second, zoooom!
VERDICT
DEVELOPER: Arducam
WEB: https://shop.pimoroni.com
PRICE: £24

PERFORMANCE 9/10 VALUE 8/10
The hardware is sound and packaged well, so if you need to

Just what the fit a camera to your Raspberry Pi, this is the one to get.
doctor ordered: a
physical mount!
Note that it is Rating 8/10
sold separately.

TUTORIALS Reaction game
PIBRELLA
Build a Python-based
reaction game
Les Pounder goes back to the early days of the Raspberry Pi to
look at a board that made a big difference to his career.
ibrella is an awesome little board. We first
P came across it in 2014 while delivering a

training course and since then we’ve used it
with hundreds of learners. This £10 board may be eight
years old, but it’s still a great way to get to grips with
OUR electronics on the Raspberry Pi. In this tutorial we’ll
learn a little about this board, and create a reaction
EXPERT game to prove who’s the fastest of them all!
Les Pounder Because Pibrella was designed for the original 26-pin
is associate GPIO Raspberry Pi it has to connect to the first 26 GPIO
editor at Tom’s pins of any Pi. The first 26 pins are from the micro SD
Hardware and a card. With the Raspberry Pi powered off, connect
freelance maker Pibrella so that it fits directly on top of the Pi. No part
for hire. He of Pibrella should “stick out” from the footprint of the
blogs about his Pi. The included rubber foot will need to be positioned
adventures and so that Pibrella doesn’t touch the Raspberry Pi. See Pibrella will work with newer models of Pi. Just remember to place it
projects at bigl.es. the guide at https://bit.ly/lxf289pibrella for details. on the first 26 pins of the GPIO.
For the project you’ll need to place a push button
into a breadboard, then connect the legs of one side to Python editor – we chose Thonny because it comes pre-
Input A of the Pibrella. It doesn’t matter which leg goes installed on the Pi. Create a new file, and for the first two
to which part of Input A, as long as you only use one lines import the Pibrella library and the sleep function
side of legs from the button. from Time.
When done, connect your keyboard, mouse, HDMI, import pibrella
Ethernet and lastly power which goes directly to Pibrella from time import sleep
via the micro USB. Once everything’s connected, boot Now let’s create a for loop that will iterate 10 times.
to the Raspberry Pi OS desktop. for i in range(10):
YOU NEED From the desktop, open a terminal and run this Inside the for loop we’ll use a function to turn all of
command to install the Pibrella Python library. the Pibrella LEDs (red, yellow and green) on at one, then
Any Pi $ curl -sS get.pimoroni.com/pibrella | bash wait for half a second, before turning them off and
Raspberry Answer the questions and perform a full install and waiting for another half second.
Pi OS after a few minutes we’re ready to create our project. pibrella.light.on()
Pibrella But first, let’s get to know Pibrella and the Python library. sleep(0.5)
breadboard Pibrella was initially designed to make interfacing with pibrella.light.off()
Button the GPIO as simple as possible. Pibrella became the sleep(0.5)
Two M-to- go-to board for educators in the early days of the Pi. Save as pibrella-test.py and run the code. The LEDs
M jumper On the left of Pibrella are four inputs (A to D), and to will blink on and off. We can replace pibrella.light.on()
wires the right are four outputs (E to H). The outputs can with pibrella.light.red.on() to control just the red LED.
Code: drive 5V DC motors, but only in one direction – there’s Replacing red for yellow or green performs the same
https:// no “flip flop” H bridge to change the polarity of the task for those LEDs. Armed with our new knowledge
github.com/ outputs. At the bottom of Pibrella is a large red button, let’s make a quick game.
lesp/LXF- and above that are three LEDs (red, yellow and green)
Pibrella/ and a simple piezo buzzer. Writing the project code
archive/ Pibrella’s Python library is simple. Using high-level Create a new file and import three libraries. Pibrella and
refs/heads/ (human readable) functions, Pibrella is easy to use. Let’s sleep, just like we did before, but we also import random
main.zip work through a quick example. Open your favourite that we shall use to generate a random number.

Reaction game TUTORIALS
will read “0” but when pressed they will read “1”, as
described by the following:
p1 = pibrella.input.a.read() Powering
p2 = pibrella.button.read() Pibrella should
We next use a conditional test that uses two if always be via the
conditions to check the value stored in the variables p1 onboard micro
and p2. If p1 (player one) variable is storing “1” then we USB port. This
know that they pressed the button first. If that is the provides power
case we’ll blink the yellow LED using Pibrella’s blink to the Pi and
Pibrella, while
function. We set the duration on and off to be 0.5
also providing a
seconds. Then the code will pause for five seconds small amount of
before we break out of the main loop. protection when
if p1 == 1: using high-
pibrella.light.yellow.blink(0.5,0.5) current draw
sleep(5) components
Pibrella makes electronics simple. We can even use it with ScratchGPIO
break such as motors.
to make electronics projects in a block-based coding environment.
The same test is performed for player two, but this
time the red LED will blink.
from time import sleep if p2 == 1:
import pibrella pibrella.light.red.blink(0.5,0.5)
import random sleep(5)
Create a variable, time, which will store a randomly break
chosen number between 5 and 10. This will make our Pibrella’s buzzer can produce simple sounds at
reaction game a little more challenging because we varying frequencies. It won’t produce high-quality
don’t know when the LED will light up. music, but with a little practice you can get a tune out
time = random.uniform(5,10) of it. Luckily for us the Pibrella Python library has two
Using the randomly generated number we tell the tunes – success and fail – that we can drop into our
code to sleep (pause) and then turn on the green LED, game. Now out of the while True loop, we’re going to
our trigger for the reaction game. play a “success” tone to signal game over.
sleep(time) pibrella.buzzer.success()
pibrella.light.green.on() To finish, we tell the code to pause for two seconds
Next, create a while True loop to continually run the before turning all the LEDs off, which will signify that the
code within. game has ended.
while True: sleep(2)
Now we read the two buttons for player one and pibrella.lights.off()
two, then store the values in variables p1 and p2. Player Save the code as reaction.py and then run the game.
one is connected to Input A, and player two is using After a random amount of time, the green LED will turn
Pibrella’s button. For both buttons we use the loop to on and then it’s “fastest finger first” to press your button
continually read the state of the inputs. By default they and win the game!
HATS, INSIDE AND OUT

Pibrella is from a time before the Raspberry Pi GPIO was expanded
to 40 pins, and a time when boards had a specification to follow.
The HAT (Hardware Attached on Top) standard was introduced
with the Raspberry Pi B+ and as well as extra pins it brought a form
factor standard which is still in use to this day.
HATs must be 65mm wide, 56.5mm length and provide 8mm of
clearance from the Raspberry Pi. The corner radius should be
3mm and at each corner there should be an M2.5 screw hole for
compatible standoffs. There should also be cut-outs for the official
Raspberry Pi camera (CSI) and display (DSI) ribbon cables to pass
through under the HAT. An example of this is the Sense HAT, which
has a cut-out for the camera.
To be officially called a HAT there needs to be a valid ID EEPROM at
pins 27 and 28. This EEPROM identifies the board to the Raspberry Pi
and tells the Pi how to set up the GPIO and other devices. Boards that
follow the mechanical requirements of the HAT standard are not
really HATs, but many are still called a HAT and the term has become Four input, four outputs, some LEDs, a big red button and a rather
part of the general language used by the community. annoying buzzer. A good deal for £10 some might say!
GET YOUR Pi FILLING HERE Subscribe now at http://bit.ly/LinuxFormat

IN-DEPTH Get packing!
GET PACKING!
Keen to give back to the FOSS community, but don’t know where to start?
Mike McCallister shows you one way to do a good deed.
ave you ever seen a nifty on a cloud server (or their own server) and packages from a single source. Today OBS
H program in Linux Format,

but couldn’t find it in your
favourite distro? If you were
build software packages for a variety of
distros in popular formats: RPM, DEB,
Flatpak and AppImage.
hosts more than 80,000 developers
maintaining nearly 750,000 packages in
150,000 repositories (see System Status
running a proprietary OS, you think that You don’t really have to know much report 3/25/2022 at https://build.
you’d have to ask the programmer to about code to make packages with OBS. If opensuse.org). Pretty successful project.
produce a version for you, but with FOSS you have some experience installing and OBS makes it possible to import source
that isn’t how things work. working with packages, or helped others code from another project into its
One of the wonders of the FOSS world with issues on a mailing list or forum, you repository. From there you give OBS the
is that you may not have to wait to run that might just be the type to be an OBS information it needs to build a package. In
program. Truth is that anyone can take any packager. Bonus points if you (a) have a turn, you can install your newly created
open source program and build a package Github (or similar) account, and (b) the package on your system.
from the source code. You can choose to command line doesn’t make you queasy. When you try this, follow these steps:
run it on your machine. If it works well In these pages, we’ll walk you through Create an OBS account at build.
on your box, you can then submit your the OBS process. You may discover a new opensuse.org and create your Project.
package to be included in the distribution way of giving back to the FOSS community Install the essential tools for packaging
of your choice. for all the fabulous software you use. software and the osc shell client on your
If that sounds cool, if a little terrifying, The OpenSUSE community created the system and connect it to the OBS server.
here’s a tool to make packaging easier: the Open Build Service to expand the pool of Fork and clone the source code of the
Open Build Service (OBS). OBS enables packagers contributing to OpenSUSE. project you want to package, and then
anyone create a repository of source files They also wanted folks to make multiple connect to OBS.

Get packing! IN-DEPTH
Configure your packages (perhaps the hardest part).

Run the build.
Creating an OBS account isn’t complicated. Head to
the public instance of OBS at https://build.opensuse.
org. Click Signup and fill out the form. Pick out a good
username. Now login with your new credentials.
When you create your account, you receive project
space on the server. Click Your Home Project on the left
navigation bar to open your packaging dashboard.
Setting up your system

You can build packages strictly using the web interface,
but if you’d rather work your magic on the command
line on your own system, you’ll download the osc client
to your system.
Install the client on any flavour of openSUSE or
Ubuntu with your usual package manager. If you use description of the package that appears in the repo Set up an Open
another distro, try installing osc. If that doesn’t work, directory. The Description enables you more free rein to Build Service (OBS)
account, then get
try adding the openSUSE:Tools repo to your favourite explain what the package does and how useful it is.
file storage and a
package manager’s source list. Chances are excellent Next, find your program’s development repository. Home Project.
you’ll find the proper repository for your system. Heck, You should be able to contact a developer or team
there’s even a tool you can run on Raspbian. See http:// via a program’s website to learn where the repo is. If
download.opensuse.org/repositories/openSUSE:/ the program you want to package uses Github and
Tools/<distro_version>/<architecture>.repo, where Gitlab, you can set up an account there, and fork the
<distro_version> coincides with your system, and application to your repo. From there, you can clone the
<architecture> is i386 or amd64. code to your computer. Before you leave here, copy the
When you have added the openSUSE:Tools repo, URL to this repository, for example https://github.
install the osc client for OBS. Make sure you also have com/<username>/<appname>.
these packages installed on your system: gcc, make,
RUNNING THE OBS NUMBERS

python, bash, coreutils, diffutils, patch. If you want to
make RPMs, install these too: rpm-build, rpm-devel,
“Today OBS hosts more than 80,000

rpmlint and rpmdevtools. If you’ve got Ubuntu and want
to make DEBs, you’ll need these: gnupg, pbuilder,
developers maintaining nearly 750,000

ubuntu-dev-tools, apt-file and dh-make.
The first time you run osc, you’ll connect to your
packages in 150,000 repositories.

Home Project on the remote OBS server with your OBS
credentials (not your current system). The client will
That’s a pretty successful project.”

then create your <OBS_username>:home directory and
add a configuration file, /.oscrc, to the system. You’re
now ready to try out OBS.
Back to OBS>Project. Click the link to the package
Pulling in the sources you created earlier. Click Add File. Paste the URL to your
To start packaging in the web client, return to your forked repo into the File URL box to upload the source
Home Project. Look for the Users tab. Click Add user, files. OBS will wrap the code into a tarball (a *tar.gz file).
and declare yourself a Maintainer by checking the Click the Repositories tab to define one or more
appropriate box. Click the Packages tab, and Create packages to make from your source code. You can
New Package. Add the Name of your package in this select any or all of the available options, but you’ll need
window. While not mandatory, you should also fill any specific config files that each distribution requires.
out a Title and Description for your package. The title OBS recommends checking both major openSUSE
(sometimes known as a Summary) is the one-line distributions if you’re targeting the openSUSE project,
BEHIND THE SCENES

Open Build Service does most of the install on the end-user’s system) RPM copies the files in the directories
actual package building on its own after and places it uncompressed into the you specified.
you finish configuring the package. While /rpmbuild/BUILDROOT directory. This For Debian and other DEB-based
OBS hides the machinations of package- directory is a “chroot jail,” a protected distros, you usually start with a “source
building behind its web interface, here’s sandbox that can’t interact with the rest package”: just the tarball with the source
what’s actually happening: of the system. code. The debhelper, or dh-make
In RPM-based distros, the RPM build When the build is complete, RPM package reads the build files located in
system takes your program from its wraps the contents of BUILDROOT into the /debian folder in the source package,
compressed archive (organised in the another archive with the cpio archiving especially the rules file, to produce the
same directory hierarchy as you want to tool. When the user installs the package, binary package that users can install.

IN-DEPTH Get packing!
so we’ve checked openSUSE 15.3 and Tumbleweed. Patch0: If the package includes a patch, include the
Just for fun, let’s pick Ubuntu too. URL for this patch.
Architecture: The architecture of the processor your
Here comes the paperwork! package will run on, such as x86_64 for a 64-bit OS.
Now comes the hard part: filling in the config files. We’ll Only if your code is compiled for a specific architecture.
start with the RPM. How does OBS know how to build BuildRequires: The packages needed to create the
your software correctly? You tell it in the SPEC file. build. If the program was written in a compiled language,
The SPEC file is a set of “directives” where you tell like C, you may not need to fill this directive if you only
OBS about your program and how it should run. It has need a shell/ubiquitous packages, to build the software.
two sections: a Preamble with metadata, and a body Requires: Another list of packages the user’s system
containing the build instructions. You’ll fill out the details needs to have for the package to run.
of your package’s SPEC file. This is best done on your The body of your SPEC file has just a few directives
system. SUSE contributed a way to generate a new for the build system.
blank SPEC file to use in packaging with OBS. Run %description: This is your marketing piece. Unlike
rpmdev-newspec <program name> and open the the one-line Summary in the preamble, here you can
SPEC file in an editor. include whole paragraphs of information.
The top of the file (the “preamble”) includes %Prep: A shell script or a set of commands to pull
descriptive metadata information important to the user your project from its archive and prepare it for building.
considering installing your software: %Build: Assuming your program is not just a shell
The first three fields, Name, Version and Release are script, use this directive to identify the right commands
required, and together form the elements of your to build the software to machine code or byte code.
package’s file name. %Install: How to copy your build artifacts from where
Selecting a
Summary: This single line offers a concise statement the build happens to /rpmbuild/BUILDROOT (more on
repository in OBS
equals building a of what your application does. this directory later).
package for that Licence information: What licence covers this %Check: Commands to run unit tests and other
distribution. The package, whether it’s the GPL, LGPL, MIT, or whatever. sanity tests before releasing the package.
distributions you URL: A link to the package’s website, where users %Files: The list of files to be installed.
can choose from
goes far beyond
can get more information on the program. There’s %changelog: If this package is an update/upgrade
OBS sponsor also more technical information in the preamble. from a previous version, list the changes here.
OpenSUSE. Source0: The path or URL that leads to your tarball. Here is what a complete SPEC file for a C language
program, from the RPM Packaging Guide: https://rpm-
packaging-guide.github.io/#working-with-spec-files
Name: cello
Version: 1.0
Release: 1%{?dist}
Summary: Hello World example implemented in C
Licence: GPLv3+
URL: https://www.example.com/%{name}
Source0: https://www.example.com/%{name}/
releases/%{name}-%{version}.tar.gz
Patch0: cello-output-first-patch.patch
BuildRequires: gcc
BuildRequires: make
%description
The long-tail description for our Hello World Example.
%prep
OBS PACKAGING RESOURCES %setup -q
%patch0
Want to learn more about packaging and the Open Build Service? %build
The OBS Documentation space (https://openbuildservice.org/help) make %{?_smp_mflags}
has manuals, videos and slide shows to help you use the system. %install
OpenSUSE’s Build Service portal (https://en.opensuse.org) %make_install
Portal:Build_Service offers information for new packagers and %files
developers. Do check out the Build Service Tutorial at https://en. %license LICENSE
opensuse.org/openSUSE:Build_Service_Tutorial, too. %{_bindir}/%{name}
The RPM Packaging Guide at Github https://rpm-packaging-guide. %changelog
github.io walks you through a standard process, minus OBS. * Tue May 31 2016 Adam Miller <maxamillion@
Red Hat offers a chapter of its manual on packaging and fedoraproject.org> - 1.0-1
distributing software. See https://red.ht/3vl0R3d. - First cello package
Debian provides help at https://wiki.debian.org/packaging/intro for Ubuntu (and Debian) packages are more complex to
packaging newcomers. Seven ways to set up Debian Unstable (aka create than RPMs. Instead of a single SPEC file, you
sid): https://wiki.debian.org/Packaging/Pre-Requisites. need a batch of text files that sit in a separate /debian
Finally, Ubuntu will also help you with its Packaging Guide at folder of the package. In the directory containing your
https://packaging.ubuntu.com/html/index.html. tarball, create a /debian folder. Open your editor and
create these required files:

Get packing! IN-DEPTH
Debian.control: This file contains all the metadata of

the package. The organisation of the file is similar to a
SPEC file, but many of the fields are different. More on
this later.
PackageName.dsc: Pulls some of the metadata from
the control file to help the OBS build tool find the tools
they need to complete the job.
Debian.rules is the most complex file. If we were still
doing things the old-fashioned way, you’d probably
already know by looking at it: this is a Makefile which
compiles the code and turns it into a binary package.
Fortunately, most of the work is automatically done
these days by the debhelper package we installed
earlier. The universal % Makefile target just runs the dh
script which will run everything needed. This debian.control
helpful to users, but is also a bit of marketing. The file is critical to
The optional stuff first line is used as the short synopsis (summary) building packages
for Debian and
Debian.changelog: only needed to describe changes description, and the rest of the description must be an Ubuntu packages.
in your package since the last version. independent longer description of the package. You have to create,
Copyright: follows the licence of your program. When you’re finished editing the /debian files, upload edit and upload it
Docs: contains any documentation files for your them into in your OBS project to OBS.
program that belong in the final package.
Source/format: describes the version format of the Building the packages
source package and should always be 3.0 (quilt). When you’ve completed the configuration files and
uploaded them to your project, OBS automatically
The control file builds the packages and stores them in their respective
Control: The first paragraph describes the source repositories. This can take time, depending on the load
package. on the public OBS servers. If you’re anxious to see the
Source: The source package name. results, building your package on your local system can
Maintainer: The name and email address of the go faster.
person responsible for the package – presumably this is To ensure that your RPM file is up to quality
going to be you! standards, OBS runs your package through RPMLint,
Priority: The priority of the package (one of ‘required’, which will identify any problems.
‘important’, ‘standard’ or ‘optional'). In general a Debian Any package you make is now stored on the
package is ‘optional’ unless it’s ‘essential’ for a standard download.opensuse.org site, available to any openSUSE
system to boot or connect with a network. user through the package search. Others can find it too,
Build-Depends: The list of packages needed to create and if you built a package for them, they can install it.
the build, if your program’s language is compiled. You In openSUSE, add your repository to YaST Software
may not need to fill this field if you only need a shell, or Repositories:
similarly ubiquitous packages, to build the software. 1 Open YaST.
The second and following paragraphs describe the 2 Click Software Repositories.
binary package(s) to be built. 3 Click Add.
Package: The name of the binary package. The name 4 Choose Specify URL from the list. Click Next.
might be different from the source package name. 5 Type a name (My OBS Repo) and the complete URL.
Architecture: The architecture of the processor your Note that you can’t add the repo until there’s a package
package will run on, such as x64 for a 64-bit OS. Debian stored there.
works on about a dozen computer architectures in total, YaST will check your type of repository and check
so this architecture support is crucial. its license before adding it to your system. For Ubuntu/
Depends: The list of packages that must be installed Debian users, you can add your repository to the apt
for the program in the binary package to work. sources.list.
Description: The full description of the binary First, open your browser to identify the mirrors
package. As with its RPM counterpart, it should be where your repository is stored: http://download.
opensuse.org/repositories/home://<username>://
<project>/Ubuntu_22.04/Packages?mirrorlist
Pick a mirror from the list, and add it to /etc/apt/
sources.list. To install your new package, run your
package manager as you would for any other package.
And there you have it. You have joined the
community of Linux software packagers, and taken
the first step toward becoming a package maintainer.
Maintainers commit to keeping that package updated
for their distro by working with the upstream developers
to keep the software up-to-date. They are important to
The OBS shell client, osc, generates this SPEC file. However, you have any vital distribution, and often honoured members of
to fill in the values and upload it to your OBS project. the development team.

TUTORIALS
TUTORIAL
EPY
Credit: https://github.com/wustho/epy
Bringing stories to
the command line
Shashank Sharma knows that the Linux CLI, once seen as the domain of
the uber geek, also serves as the pathway to the myriad worlds of stories.
popular quote, often attributed to Albert formats, we’ll also discuss ebook-convert, (see below left)
A Einstein, goes, “If you want your children to be

intelligent, read them fairy tales. If you want
a nifty utility that can be used to convert ebook files
from one format to another.
them to be more intelligent, read them more fairy tales.”
Teddy Roosevelt was just as much a fan of reading, and Easy as pie
is quoted to have said, “Now and then I am asked as to You might think that the choice of heading here has
OUR ‘what books a statesman should read,’ and my answer
is, poetry and novels – including short stories under the
something clever to do with epy, but alas that isn’t so.
We settled on that heading because of the alliteration.
EXPERT head of novels.” With many seminal works now available With the exception of Arch’s AUR, you won’t find epy
Shashank in the public domain, and ebooks being churned out in the software repositories of most popular desktop
Sharma with incredible passion and frequency, for all this distribution. But that’s no cause for worry because the
is a trial lawyer reading to be done, one needs the right tools for the job. installation is fairly straightforward. If you already have
in Delhi and an In addition to epy, which is an incredibly robust pip package manager installed, you can install epy with
avid Arch user. ebook reader that support a multitude of popular the pip3 install epy-reader command. Depending on
your system configuration, you can either append sudo
at the start of the command to install it for all users, or
CONVERTING EBOOKS instead use the pip3 install epy-reader --user
command to install the tool in the ~/.local/bin directory.
If you read ebooks on various devices such as tablets, desktop or Released under the GPLv3 license, epy was forked by
Kindle, then it makes sense to retain ebooks in the format supported the author from his previous epr utility, which itself was
by all devices. While most desktop ebook readers support various released under the MIT licence. Unlike the parent
popular ebook formats such as EPUB, MOBI and PDF, some devices project, epy boasts several features such as bookmarks,
such as Kindle are far more limited. It makes sense to have all your external dictionary integration and URL support.
ebooks in the same file format so that they can easily be moved If you already have ebooks at hand, you can start
between devices per your convenience. reading immediately by running the epy /path/to/
Thankfully, a nifty command-line utility does this trick. If you work
with ebooks, you might already be familiar with Calibre, a popular
graphical ebook manager. In addition to doubling as an ebook viewer,
you can also use Calibre to download news and magazines from the
web, share and backup your library, convert between ebook file
formats, edit the metadata on your books and more.
You’ll find Calibre in the software repositories of most popular
desktop distributions. Once installed, you can use the included
ebook-convert command-line utility to quickly convert files from one
format to another.
To convert an EPUB file to MOBI format, run the ebook-convert 2\
-\ gods-of-mars.mobi 2-Gods-of-Mars.epub command.
Depending on the source ebook, you might wish to adjust the base
font size, or move the table of contents (TOC) from the start of the file
to the end. These adjustments and more can also be done with ebook-
convert. Refer to the project’s man page for more details. The progress at the top-right of the screen is only visible if your
terminal emulator window is wide enough. Press s to toggle it on or off.

Terminal TUTORIALS
ebook.mobi command. Apart from the mobi format,

epy also supports epub as well as azw and fb
(fictionbook) formats.
When reading an ebook, you can access the table of
contents (TOC) at any time by pressing t. The epy
project boasts of a number of keybindings, which you
can access by pressing ?, but we’ll list a few useful ones
to help you get the most out of the reading experience:
Keybinding Function
t Open table of contents
c Change colour
n Go to next chapter
p Go to previous chapter
d Define word
b Add a bookmark
B List bookmarks
command epy princess opens the first book in the Even if you make
/ Regex search series, while epy swords opens the eighth book in the no changes, go
through the
M View metadata information classic pulp fantasy series.
~/.config/epy/
configuration.json
Start reading Configuration file for an idea of
The epy tool remembers your reading history, so you One of the greatest joys of reading is expanding one’s the features on
don’t have to specify the complete path to the ebook vocabulary. But this only works if you can quickly look offer, such as text
to speech and
each time you launch epy. Instead, you can run the epy up the meaning of new words in a dictionary. Thankfully, mouse support.
command, and the project automatically opens the last epy supports tools like dict and wkdict, which you’ll find
ebook you were reading, at the location where you left in the software repositories of most popular desktop
off. Even better, when you specify the path to a book, distributions. Once installed, you can edit the ~/.config/
epy will open at the position where you left off. For epy/configuration.json configuration file and make the
instance, if you’ve just started chapter seven of book A, necessary changes. Look for the "DictionaryClient": In addition
and then read three chapters of book B, when you open “auto”, line and change “auto” to the name of the to Project
Gutenberg,
book A again, epy will open it at chapter seven. dictionary tool you installed. Because we installed dict
there are other
You can access your reading history by running the on our test machine, we changed the line to
communities
epy -r command: “DictionaryClient": “dict”, . that provide
1 17% 11:29PM Apr 01: Works of Edgar Rice Burroughs When you now press d while reading a book, you’ll be access to public
- Burroughs, Edgar Rice... prompted to enter the word that you wish to look up in domain works.
2 3% 10:15PM Apr 04: Thuvia, Maid of Mars - Edgar the dictionary. See Global Grey
Rice Burroughs (/media/l... You can also change the default keybindings by Books (www.
3 20% 03:27PM Mar 27: The Gods of Mars - Edgar Rice editing the ~/.config/configuration.json file, which is globalgreye
Burroughs (/media/linux... also home to various other editable parameters. For books.com)
4 31% 05:57PM Apr 01: Swords of Mars - Edgar Rice instance, the epy tool utilises an animation when or Standard
Ebooks (https://
Burroughs (/media/linuxla... scrolling pages in the book. If you find the feature
standard
5 10% 03:27PM Apr 07: Llana of Gathol - Edgar Rice distracting, open the configuration file in your favourite
ebooks.org).
Burroughs (/media/linuxl... editor and change the "PageScrollAnimation": true, line If you’re
6 35% 03:27PM Apr 07: A Princess of Mars - Edgar Rice to “ PageScrollAnimation": false, . interested in
Burroughs (/media/lin... By default, the tool displays the reading progress at scholarly or
Each book in history is allotted a number. You can the top left corner, but this too can be turned off by academic works,
quickly open a book from the library using the assigned changing the "ShowProgressIndicator" line in the see HathiTrust
number with the epy <num> command. For instance, config file. (www.hathi
the command epy 4 opens the Swords of Mars book In addition to the variety of ebook formats, epy also trust.org), a
from our reading library. The epy -r command also supports working with URLs, so you can read books not-for-profit
collaborative
shows the progress as well as the date and time when directly from Project Gutenberg without downloading
efforts of
the file was last accessed. them first. The command epy https://gutenberg.org/
various
If you don’t like the idea of repeatedly looking up the files/1268/1268-h/1268-h.htm enables you to read Jules academic
reading history to confirm the assigned number before Verne’s The Mysterious Island without having to and research
opening a book, you can also use a match string to download an EPUB or MOBI format. Unfortunately, this libraries.
inform epy of the book you wish to read with the epy feature only works for books that have been properly
<string> command opens the book that matches the formatted in HTML, so you won’t be able to indulge in
specified search string. From our reading history, the fan fictions using epy.
ENHANCE YOUR TERMINAL-FU Subscribe now at http://bit.ly/LinuxFormat

TUTORIALS Hard drive cleaner
CZKAWKA
Credit: https://github.com/qarmin/czkawka
Quickly track down &

delete unwanted files
Nick Peers takes a deep dive into this fast-evolving and brilliant
tool for finding and removing redundant files from your PC.
eeping your hard drive clean can feel like an
K uphill struggle as it fills up with detritus.

Weeding through your files by hand is a
painstaking task, and this is where a search-and-delete
tool like Czkawka comes riding to the rescue.
Czkawka can do so much more than find duplicated
files. It can also track down similar images and videos,
EXPERT music duplicates, broken files (and symlinks), empty
Nick Peers files and folders, and more. It’s written in Rust, uses
was unsurprised caches to speed up follow-up scans, and is available
– but still both via the Linux desktop and as a CLI application.
unnerved – by
the thousands of Gettingt started Manually selecting files by hand can be time-consuming. Let
potentially Czkawka can be installed in various ways: via snap, Czkawka’s automated select tool lend a hand.
redundant files Flatpak (https://flathub.org/apps/details/com.github.
that Czkakwa has qarmin.czkawka) or you can download the AppImage $ sudo apt update && sudo snap install czkawka
found on his (https://github.com/qarmin/czkawka/releases). If $ sudo snap connect czkawka:removable-media
hard drives. you install it through snap, you’ll need to give Czkawka If you plan to use Czkawka’s Similar Videos tool, you’ll
access to all your drives: also need ffmpeg. If you get a warning when you attempt
to use the tool, simply install it thus:
$ sudo apt install libgtk-3-dev ffmpeg
TERMINAL USE You’ll also need to install an ALSA lib package to include
music files in the Broken Files Finder search. On
If you’d like to incorporate Czkawka into batch scripts, or run it from Ubuntu, use the following command to install the
the Terminal, you’ll first need to install the czkawka_cli command-line missing package:
tool, which requires compiling and installing separately: $ sudo apt install libasound2-dev
$ sudo apt install -y curl git build-essential
$ curl --proto ‘=https’ --tlsv1.2 -sSf https://sh.rustup.rs | sh Start your searches
$ sudo apt install -y libgtk-3-dev If installed through snap, launch Czkawka via the
$ git clone https://github.com/qarmin/czkawka.git && cd czkawka application launcher. As the annotation (see right)
$ cargo run --release --bin czkawka_cli reveals, it’s split into various sections, covering the
Once done, you’ll be able to use czkawka_cli by following the selection of files, which file-cleaning tool to use,
standard syntax: reviewing your results and finally performing actions
$ czkawka_cli tool -flag options to clean up your files.
The CLI version supports 12 tools, comprising all the functionality Most of these tools are self-explanatory: Duplicates,
of the main program: big for large files, dup for duplicates, image for Empty Directories, Big Files, Empty Files, Temporary
finding similar images, and so on. Files, Similar Images, Similar Videos, Music Duplicates,
The CLI doesn’t offer any interactivity, so by default each tool will Invalid Symlinks and Broken Files. We’ll cover them in
simply perform the required scan, then display the results of its more depth shortly.
findings in the Terminal window. You’ll need to re-run the command First, select which directories to include in your
using the -D flag to remove files (for example, -D AEN would delete scans. By default, only your home directory is included.
all files except the newest version). You can also save the results to a If you’ve launched Czkawka without admin privileges,
file using the -F flag (so -F <filename> ) for reviewing more carefully you’ll be restricted to only those folders and files your
before making any firm decisions. user account has access to. This is a good thing:
Czkawka should primarily be viewed as a tool for helping

Hard drive cleaner TUTORIALS
you streamline your personal files by weeding out

duplicates and enabling you to finally tackle those
folders packed full of similar images.
With this in mind, you may not need to extend your
search any further than your home directory. Indeed,
you might prefer to focus your search on specific
directories (Documents, Pictures, Music and so on)
within your home directory, in which case select your
home folder and click Remove before adding your
choice of subfolder(s) via the Add button.
On the other hand, if you’re searching for duplicates,
but want to designate a specific folder as the ‘source’
folder (in other words, files from this folder are kept no
matter what), then you’ll need to select this folder and
Looking for a quick
tick the box next to it. Doing so identifies that folder as a oldest file in each group or all but the oldest or newest and easy way
‘Reference folder’, which means its files are considered file in groups of three or more duplicates. Most to free up drive
the ‘originals’ and untouchable. intriguing is the ‘Select custom’ option. This enables you space? Czkawka’s
to choose based on name, path or Regex Path + Name Big Files tool
could help.
Track down duplicates (for more complex suggestions).
As its name implies, the Duplicate Files tool enables you Once you’ve made your choice, click OK and see
to search all specified folders for files that match exactly which files have been selected – you can then manually
by file name, size or hash. Use the ‘Check method’ drop- fine-tune this list or use the Select button to reverse or
down menu above the (currently empty) results pane to even wipe clean (‘Select none’) the selection to start the Different cache
choose what you’re searching for. selection process again. files are used
Choosing a file name is obviously the least reliable – for different
files are matched by name only, not size or content, so Process duplicates scan settings.
Czkawka will pair completely different files that happen Czkawka is nothing if not flexible, so you have several You can access
to share the same filename. File size is more accurate options when choosing what to do with those these for
and quicker than matching by hash, but again there’s no duplicates. Delete will remove all selected files from by clicking
the spanner
guarantee that two files of the same size are identical. your hard drive, or you could click Move instead to move
icon to open
The safest option is to stick to the ‘hash’ option, them all to another directory or drive, just in case you its settings,
which is the slowest – but most accurate – way of need to restore one or more later. followed by
rooting out duplicates. The method combines the file The Save button creates a text file listing your ‘Open cache
size search to ensure only those files identically sized search results, stored in the root of your home folder folder’, found
are checked with the hash, which determines that the as results_duplicates.txt, enabling you to review the under General.
contents are identical. Selecting this option also gives results at your leisure. If you plan to move files instead
you a ‘Hash type’ drop-down menu offering three
choices: Blake 3, CRC32 and XXH3. All three will identify EXPLORING CZKAWKA
duplicates, but XXH3 is quicker than the other two. On
fast drives with small folders, the default Blake3 is fine, 1
but otherwise consider using XXH3.
Once you’ve made your choices, click the Search
button in the bottom pane. A list of duplicates will be 3
presented in the results pane within seconds. You’ll be 4
shown three columns of information: the file name, its
path and – be prepared to expand the program window
to reveal this – the modification date of each file.
If you need more help identifying the file, click it if it’s
an image and a preview pane will appear. You can then
click the other duplicates to verify they’re the same file. 2
Otherwise, try double-clicking a file to bring up an ‘Open
with’ dialogue, enabling you to select a suitable 6
application to review it (and its alleged duplicates).
5
Once you’ve reviewed the files, what then? Assuming Selection panel Preview pane
you want to remove some or all of the duplicates, you 1 Choose which folders to include in your 4 When reviewing image files, click one
have two basic options. Either you can manually go hunt for unwanted files here. Tick Reference to bring up a preview, which will enable you to
through the list ticking the box next to each item you Folders to protect files in that folder from being perform visual comparisons.
targeted for deletion.
wish to remove. Alternatively, suppose there’s a lot of
Notifications pane
items to process, and they share similar characteristics. Tools list 5 The results of your searches and actions
If they’re the oldest or newest file in the selected group, 2 Select which of Czkakwa’s 10 tools you are displayed here, together with any helpful
or they share a specific path and filename, for example, want to use from here. (or unhelpful) messages.
you can automate the selection process.
Results window Actions
To do this, click the Select button to reveal a pop-up 3 After your scan is performed, duplicates 6 After using the Select button to help
menu: while the Select All button isn’t relevant here, the and other potentially removable files are listed choose which items to process, use these
other options are: you can quickly select the newest or here ready for selection. buttons to perform specific actions.

TUTORIALS Hard drive cleaner
of deleting them, this file will help you put back those before clicking Search. Again, files can be deleted or
files later if necessary. moved only. The Temporary Files search works similarly,
Click the Suppose you’re worried that deleting duplicates except it targets what the author describes as the
spanner icon could have ramifications for other applications. In that ‘most basic ones’ only. See the box (below) for his
to access
case, another option might be to replace unwanted recommended alternative for removing potentially
Czkawka’s
duplicates with symlinks or hard links, which will free up redundant system files.
settings.
If you’re drive space, but ensure no application loses access to At the bottom of Czkawka’s list of files it can fix are
nervous about the file. You’ll need to select at least two items in the tools for rooting out invalid symlinks and broken files.
accidentally group, and the first item in the list will be left unchanged, The Invalid Symlinks tool will display the symlink file
deleting the with any other selected items being replaced by name and folder, its destination path and the error type.
wrong file, tick symlinks or hard links as required. The good news is The Broken Files tool locates corrupt files and those
‘Move deleted that you’re not forced to apply one option to the entire with invalid extensions. Three file types are supported:
files to trash’ list. Simply select your target items for one action, images, archives and (if you’ve installed libasound2-dev)
and click Save process them, then move on to the next set of items. audio. Czkawka tests each file by attempting to open it,
configuration to
assuming if an error is generated, the file is corrupt or
add a fail-safe
step against
Locate empty items unsupported. Where errors are found, try opening the
a potentially Czkawka offers two options for locating – and removing file yourself because it’s not a foolproof tool.
devastating – empty files and folders, one for each type. As with
mis-click. duplicates, a list of any offending items appear, and you Weed out visually similar images
can then double-click to open them to verify they’re Digital photography may have eliminated weak photos,
empty before proceeding to delete or move them. If an but chances are that’s at least only partly true because
empty file is linked to an application you’ve not removed you’re smart enough to take four or five shots each
– such as an empty log file – use DuckDuckGo to make time, ensuring at least one will be usable. But it’s all
sure you won’t break anything by removing it. too easy to leave the unwanted photos in place, even
If you’re looking to free up space in a hurry, you’ll as your hard drive steadily increases.
want to target the biggest files in your collection. At some point you should take the time to go through
Czkawka’s Big Files search will list the 50 largest files it them all, eliminating the unwanted shots. And that’s
finds by default, but you can adjust this figure using the where Czkawka’s Similar Images tool comes in, enabling
‘Number of shown files’ field above the results pane you to group visually similar photos (such as resized
versions or those containing a watermark) to choose
which one to keep.
The walkthrough (opposite) reveals how it works:
Czkawka generates individual hashes for each image
file using your choice of hash type, hash size and resize
algorithm. All but one hash type resizes the original
image to produce a smaller cache according to the
hash size (8x8 by default, but up to 64x64, which
means more accurate comparisons, so fewer matches,
but larger cache files and slower scan times).
There are also four resize algorithms to choose from
when resizing your image hashes. Of these, the worst
by far is Nearest, but otherwise there’s not a huge
difference. For most people, the defaults (Lanczos3,
hash type gradient, hash size 8) are sufficient.
Czkawka enables you to experiment with different
scan settings. It keeps separate cache files for each
setup, so once the initial scan is performed for each,
Giving your system files a proper cleanout? Then consider pairing Czkawka with Bleachbit. subsequent scans are much quicker. The latest version
CLEAR TEMPORARY FILES

One thing that Czkawka (currently) hunt out temp files across your system click Preview to see what it can find.
doesn’t do well is rid your hard drive and a range of programs, including your If you installed Stacer (https://
of system and temporary files. web browser(s). oguzhaninan.github.io/Stacer-Web)
Its tool simply targets files based Avoid the version shipped with your following our tutorial in LXF284, then its
on their file type: #, thumbs.db, distro, and instead download the latest System Cleaner tool is another option
.bak, ~, .tmp, .temp, .ds_store, version as a .deb direct from the author worth trying. This focuses on package
.crdownload, .part, .cache, .dmp, (www.bleachbit.org/download/linux). and application caches, crash reports,
.download and .partial. Once installed, it can be run under your application logs and the trash. It’s not
If you’re looking for a tool that can do normal username as well as the root user as comprehensive as Bleachbit, but
a better job of removing such useless (choose the ‘as admin’ version from the it’s still a good step forward from what
flotsam and jetsam, pair Czkawka with launcher). From here, tick the parts of Czkawka’s limited temporary files cleaner
(see the grab above) Bleachbit, which can your system you wish to clean and then can achieve.

Hard drive cleaner TUTORIALS
of Czkawka also debuts a tool for comparing videos to

help you weed out similar ones similar to the Similar
Images tool. Here, your options are much less: a simple The Czkawka
similarity slider plus an option to exclude files of the website
(https://github.
same size (typically exact duplicates) from the results.
com/qarmin/
Beneath this is the Music Duplicates button, which
czkawka)
scours MP3, FLAC and M4A audio files for duplicates is packed
based on your choice of tags: title, artist, album title, with useful
album artist and year. An ‘Approximate Comparison’ information,
option uses AI to remove parentheses from phrases including
(such as remixes or live versions) to provide you with a pages in the
list of multiple versions of the same song. Instructions
Czkawka continues to enjoy lots of care, and folder that
attention from its author – the recently released make up a
manual of sorts.
version 4.0 added similar video support reference
folders (to protect a single folder from any changes)
and revamped the tool’s performance through support
for multithreading. It’s got a bright future, and your Czkawka’s Music Duplicates tool is a little crude, relying on metadata to
hard drive will be all the better (and emptier) for it. determine if files are matches or not.
FIND VISUALLY SIMILAR IMAGES
Set search options Fine-tune your search settings

1 Select Similar Images and choose the folder or folders 2 The Similarity slider enables you to determine how closely
containing all your images using the Add button. Above the matched each image must be. Leave it set to ‘Very high’ for now.
results window you’ll see a series of options – the three drop- Tick ‘Ignore same size’ only if you want to ignore exact duplicates,
down menus at the top affect the speed (and quality) of the scan and leave ‘Fast compare’ unticked, too. Click Search and wait
process. Leave the defaults as they are for now (see the body while Czkawka performs its initial scan of your files to determine
copy for tips on tweaking these). potential matches.
Scan and tweak Review results

3 The initial scan will take some time to complete, but a 4 Select each result in turn and you’ll see a preview appear
cache file is generated that will speed up future rescans with in the right-hand pane. Click the Compare button beneath to view
different settings if they’re required (you can also tick ‘Fast the matched photos side-by-side in a separate window. You can
compare’ if you move the similarity slider right to speed things then tick the ones you wish to remove or use the Select button
up, too). If no results are returned, verify you’ve not ticked for batch selections (you’ll notice an additional option to select all
‘Reference folder’. Finally, a list of matches should be displayed. but the biggest/smallest in addition to the usual choices).
FIND SIMILAR THINGS EVERY ISSUESubscribe now at http://bit.ly/LinuxFormat

TUTORIALS Emulate the Amstrad PCW
JOYCE
Credit: www.seasip.info/Unix/Joyce
Emulate the classic

Amstrad PCW
Les Pounder goes back to school, a time when his form room
was full of Z80 computers and noisy dot matrix printers.
t high school we had a business
A studies room, next door to our IT

department (Goldstar 286 PCs
and the RM Nimbus!), which doubled as a
CREDIT: Marcin Wichary, CC BY 2.0, https://commons.wikimedia.org/wiki/File:Amstrad_PCW_8512.jpg

form room. Everyday we sat there for
OUR registration and important messages, but
sometimes we were let loose on the
EXPERT computers. However, these weren’t x86
Les Pounder machines. Rather, they were Amstrad
is associate PCW8256 and 8512 powered by the mighty
editor at Tom’s Zilog Z80 processor.
Hardware and a Amstrad, founded by Alan Michael
freelance maker. Sugar (AMS-Trading) in 1968 was a
He blogs about well-known manufacturer of low-cost
hacks and makes computers and consumer technology.
at bigl.es. Sometimes its consumer tech was
maligned, but in the realm of computing
Amstrad had success and gained a strong
following. The company would later
purchase the Sinclair brand from Sinclair
Research (which saw new models of the
ZX Spectrum being released).
Amstrad had a history of producing
cheaper computing hardware, and in
the case of 1985’s PCW8256 the £300
asking price (adjusted for inflation this
is approximately £1,000 today), which
was a steal compared to Apple’s $2,600
Macintosh Plus. But in classic Amstrad
fashion, the PCW range was initially business Designed for the office, the PCW8512 was a compact and cost-reduced
focused and this saw a few cutbacks, and proprietary business powerhouse that took on Apple for early DTP projects.
additions to the package.
Hidden in plain As you can probably guess, the PCW 8256 has shared the same basic aesthetic: an all-in-one screen
sight is Joyce’s
256KB of RAM, while the 8512 came with 512KB. This and disk drive (some with dual drives) with an 82-key
menu. To show
was plenty for the era and the industry standard CP/M keyboard connected via a DIN-type connection. The
the main menu
press F9 and operating system. CP/M (Control Program/Monitor) bundled dot matrix printer cemented the focus on
then navigate was created in 1974 for Intel 8080-based machines. home office/business use, but it also supported a
using the mouse Loaded via a three-inch floppy disk, incompatible with popular desktop publishing scene.
or keyboard. To 3.5 inch disks of the time, CP/M provided a basic OS The 8256 and 8512 were replaced with the 9256 and
boot from an from which we could launch programs and manage files. 9512, which saw a slight change in form factor to a more
alternative disk Going back to the disks, the choice for a three-inch “PC” looking unit, and we saw 3.5-inch floppy disk
press F3 and drive was based on it having a simpler electrical drives. In 1995 we saw the PcW16 released at a time
then follow interface. This meant that users had to purchase when PCs were claiming dominance over the home
the standard
bespoke disks for their PCW, and for a short time these computer market. While the PcW16 was interesting, it
disk menu.
disks were hard to come by. The PCW 8256 and 8512 wasn’t backwards compatible with the older models,

Emulate the Amstrad PCW TUTORIALS
Then build the software into an executable.

$ make
We next run a check to ensure our build is correct: In Mallard 80
$ make check BASIC we can
tidy up our code,
Finally we install Joyce to our system. Note that we
ensuring that
need to use sudo to do this.
line numbers
$ sudo make install are equally
Depending on your machine this can take a few spaced by using
moments to complete, but once done we’ll have Joyce the RENUM
installed on our system. command. This
There are two ways to invoke Joyce. The first is a also adjusts the
windowed version: line numbers
$ xjoyce that are
The other is a full-screen emulator. referenced in
other sections
$ xjoyce -f
of your code.
Using CP/M
We used the standard xjoyce command to load a
windowed version. On first boot Joyce will ask us to
set up a boot disk. Select “Set up boot discs properly”
It may not look like much, but CP/M is an easy-to-use and powerful and then in the next menu select Disc File… Our disc
A multitasking
operating system for Z80-based computers. file is CP/M. OS for CP/M-
CP/M was the only operating system that came with based computers,
and was under-powered for the time. This was the last the PCW8256/8512 machines. Given the low spec of SYMBOS is
model of PCW released, and Amstrad focused more on the machines it’s a natural fit. CP/M is still under fantastic. It eats a
lot of RAM, but for
consumer tech until its purchase by Sky in 2007. copyright, despite being very old. You can find .dsk the “cool factor”
images for CP/M to work with Joyce online, but finding it can have all the
Emulating the Amstrad PCW them is left as an exercise for the reader. Copy the CP/M RAM it wants.
The best emulator that we found for this task was Joyce
(www.seasip.info/Unix/Joyce). Installation is tricky
because there’s no installation candidate in the
repositories and so installation involves downloading,
extracting and compiling the emulator, but it does have
a few dependencies that we need to address: SDL,
libpng and libxml2. All of the files are in the Ubuntu
repositories.Download Arculator 2.1 for Linux. We
couldn’t do this via a browser, so we used wget.
$ wget http://www.seasip.info/Unix/Joyce/joyce-
2.4.0.tar.gz
Extract the files to a directory. Navigate to the
extracted files directory via the Terminal, update your
repositories and then install the dependencies:
$ sudo apt update
$ sudo apt install libsdl1.2-dev
$ sudo apt install libpng-dev
$ sudo apt install libxml2-dev
In the same directory as the extracted files we
configure Joyce based on our specific system:
$ ./configure
TAPPING INTO THE POWER OF SYMBOS

In the 1980s, the Z80 reigned supreme. 4MHz Z80s, this is an awesome SYMBOS comes with everything a
It was everywhere, and the processor programming achievement. Taking the desktop of the era should expect. A
can still be found in industrial and PCW shortcomings into consideration, notepad, image viewer, control panel – all
commercial machinery. But while the any type of graphical output is amazing, provided by a Windows 3.1-styled user
Z80 was a beast of a CPU, it couldn’t but SYMBOS is truly multitasking, with interface. There’s also a basic video
manage to run a graphical OS. Until now. games and applications running at once! player. Don’t expect crisp 1080p Big Buck
SYMBOS (SYmbiosis Multitasking Created back in 2000, SYMBOS is still Bunny, more of a low-res slideshow, but
Based Operating System) is a being actively developed, with a achieving this on a Z80 is truly amazing.
multitasking OS for the PCW, CPC, MSX community of coders tinkering on SYMBOS can be downloaded from
and Enterprise 64/128 computers. additions and enhancements to this www.symbos.de and it works with the
Considering that SYMBOS is meant for free download. Joyce emulator.

TUTORIALS Emulate the Amstrad PCW
Okay, let’s flex a little BASIC muscles, we’ve done this

a few times on many different machines but we start as
always with the ol’ 10 PRINT project. Each line of BASIC
code for a project will start with a number, 10, 20, 30
and so on. This tells the interpreter the sequence of
code: it jumps from one line to the next in ascending
order. But why do we do this? Quite simply, if we make a
mistake and miss out a line of code we can insert
another line of code without messing up the original
code. Let’s do the 10 PRINT project to illustrate this.
10 PRINT “HELLO WORLD”
Next is line 20 and here we use a for loop, which is a
loop that will iterate 10 times. Each time the loop goes
round it counts the iteration, adding one to the total as
it iterates.
20 FOR A=1 TO 10
Line 30 and we print that LXF RULEZ!. This is inside
the for loop so it will print this line 10 times.
30 PRINT “LXF RULEZ”
Line 40 sees us instruct the for loop to iterate until it
hits 10.
40 NEXT
It took us longer If we RUN this code it will print “HELLO WORLD”
than normal to disk image to ~/Joyce/Disks/ and in the Joyce emulator and then “LXF RULEZ” 10 times.
write this feature, navigate to that location and select the disk image. Click What if we want to add another line to our short
because Sky War OK to load the disk. When prompted to give the disk a sequence of code? The solution is to insert a new line
is such a good
short name, type CP/M and press Enter. between 30 and 40. Logically this would be 31, giving us
River Raid clone.
Joyce will now open a general user interface, and we many more options to expand or correct the code. But
can see that CP/M is option 1. Press 1 to insert the we are going to use 35 because this is just a simple test.
CP/M disk and boot. After a few seconds the CP/M 10 PRINT “HELLO WORLD”
prompt will appear, and it has a look and feel of early 20 FOR A=1 TO 10
MS-DOS. CP/M is a fun operating system to tinker 30 PRINT “LXF ROOLZ”
with, and you can learn more about the commands at 35 PRINT “SO DOES TOMS HARDWARE”
Bored of typing www.primrosebank.net/computers/cpm/cpm_ 40 NEXT
in line numbers commands.htm. Now RUN this new code and you will see alternating
for your BASIC For now let’s turn our attention to something more lines of LXF ROOLZ and SO DOES TOMS HARDWARE
projects? Using BASIC – pun intended! (Tom who?–Ed) on the screen. The keen eyed among
the AUTO
you will notice the typo for TOMS . This is intentional
command
Mallard BASIC
Writing some BASIC because the ‘ (apostrophe key) is mapped to SHIFT 6 on
will add them Amstrad’s PCW range is not well known for their BASIC the PCW keyboard, but despite our best efforts we
for you, starting prowess, which is a shame given how much we loved couldn’t replicate ‘. Instead we saw a garbled character.
from 10, hacking around with BASIC on the CPC 464. For the To save our code to the disk, we simply use the Save
incrementing by PCW range, specifically CP/M, we have Mallard-80 command along with a filename:
10 for each line. BASIC and to start the BASIC interpreter we need to SAVE “FILENAME”
Need to start type the following: Then press Enter. Change the filename accordingly – no
from a higher basic extension is required. Our project code is now safe on
number? Just If we ever want to leave the interpreter, type the disk, so let’s come out of the BASIC interpreter to
use AUTO 100 to
system see the file:
start from 100.
and then press Enter. system
BARE-METAL Z80 MACHINES

We’re lucky enough to own a small Z80- then presented with a classic BASIC can even add basic VGA output using a
powered machine, in this case an RC2014 interpreter and spent a fun few hours breakout designed for the £4 Raspberry
Micro kit. The kit itself is £54 and you writing code. Pi Pico.
need to solder it yourself, but that was If you want to take the project a step If all of these retro computer hardware
part of the charm. We’re building a further, the RC2014 Mini is a slightly kits have inspired you to pick up a
computer from scratch, not just plugging more powerful unit, which has an soldering iron, head over to https://
in components. optional CP/M module that we can use rc2014.co.uk and grab yourself a basic
The kit took around an hour to solder to build our own CP/M computer. When (pun not intended) kit to start you off. We
and we then connected it to our connecting other modules we can add chose the Micro because it was the
computer using a USB to Serial converter Wi-Fi via an ESP8266, Serial via a cheapest, but the Mini offers more
and the tio serial console tool. We were Raspberry Pi Zero and astonishingly we expandability for not much more money.

Emulate the Amstrad PCW TUTORIALS
Now look for the file, which has the extension BAS:
dir
To launch the code in BASIC all we need to do is use
the BASIC command and call our file.
BASIC test.bas
We can also load the file inside the BASIC interpreter
using the load command.
LOAD “FILENAME”
Then we need to use RUN to start the code. A
quicker way is to just use RUN.
LOAD “test”
Using BASIC on the PCW is not as refined as the CPC
464, but it’s still a great experience. If you’d like to know
more then the complete manual can be found online at
https://bit.ly/lxf289-mallard-basic-pcw.
Playing a game
Let’s be honest, the PCW range was not marketed as
video games machines. However, the Zilog Z80 CPU
and 256KB of RAM means that it could produce some
decent games. Games can be found online, typically
The Joyce
using the DSK file format. They can be loaded by around £100, but they are worth the expense as the
interface is a
pressing F3 from Joyce’s main menu, then navigating original discs become more fragile. nod to the era it
to the disk image. Games will typically autoplay. As ever with retro hardware, make an informed emulates. There’s
From the list of games we tested we found a version purchase. Do your research and learn what perils a hidden menu
of 2048, the sliding tile puzzle game that was written in await those who make a purchase carelessly. A simple for tweaking
our setup.
2018. That was an addictive half-hour away from Wordle. capacitor replacement is an easy job, but older tech
We then spent far too long playing Sky War, a clone of often has hardware that’s irreplaceable, so make sure
River Raid. Even on the rather limited graphics of the to check before you apply the soldering iron.
PCW the sprite work was detailed and bold.
The Amstrad PCW legacy
The Amstrad scene It was never a gaming machine, but it never claimed to
If emulation has whetted your appetite for the real be. What the PCW range offered was a home office setup
hardware, then there are some bargains to be had. If you on a budget. They were a charming presence in home
don’t mind a “fixer-upper” then you can pick up an 8256 computing, where we had just enough power to realise
for around £50. Models in better condition go for over our ambitions. Fanzines, magazines, spreadsheets and
£100. There are RAM upgrades available for the 8256, word processing may sound dull by today’s standards,
bumping it up to 512KB of RAM. but just like BASIC provided a grounding for bedroom
Because the supply of three-inch disks is finite, and coders, LocoScript et al provided the foundation for
bit rot is bound to claim more disks, there are floppy writing and producing our own content.
drive alternatives to be had. Gotek is the name to look
for and these drives provide a means to load disk
images from USB. They aren’t cheap, coming in at HISTORY OF THE PCW
The founder of Amstrad, Lord Alan Sugar, reportedly sketched out the
original Amstrad PCW as a low-cost replacement for a typewriter. It
was a single-box design with integrated portrait display and printer –
largely because the biggest use for computers at the time was for
word processing. PCW stood for Personal Computer Word-processor,
while the printer was spun out as a standalone unit and a traditional
(due to cost) landscape display ended up being used.
The original PCW 8256 shipped in 1985 with a separate keyboard,
printer and a main unit with a 12-inch green monochrome CRT display
with an unusual 32 lines of 90 characters. This diverged from the
normal 25x80 character displays of the time.
The PCW 9512 was launched two years later. This device moved to
a white monochrome display and offered a parallel port, enabling non-
Amstrad printers to be used. This model survived until 1991 when the
PCW 9256 launched with a standard 3.5-inch floppy drive. The last
gasp was the PcW16 in 1995, which still ran a Z-80 CPU but wasn’t
Swapping disks is easy. Press F9 to open the menu, F2 for Disc, eject compatible with the PCW. It was a flop.
the current and insert a new disk to load your application or game.
IMPROVE YOUR LINUX SKILLSSubscribe now at http://bit.ly/LinuxFormat

BACK ISSUES
BACK ISSUES MISSED ONE?

ISSUE 288 ISSUE 287 ISSUE 286
May 2022 April 2022 March 2022
Product code: Product code: Product code:

LXFDB0288 LXFDB0287 LXFDB0286
In the magazine In the magazine In the magazine

From flashing Discover the ins Not all VPNs
lights to image recognition and even and outs of the Linux kernel. Then are created equally – find out how to
an aircraft tracking system – we turn your hand at open source avoid second-rate services and
show you how to get more from projects including ebook publishing, maintain your privacy online with our
your Raspberry Pi. Elsewhere, we home automation and organising in-depth feature. We also test five
transform photos and video with your research efforts. We test five GUI text editors, show how to build a
the G’MIC plugin, emulate the Acorn alternatives to Ubuntu, preview distro from the ground up using
Archimedes, process satellite Valve’s exciting Steam Deck Linux From Scratch, emulate an
imagery, find out how practical it is handheld console, and discover MSX, set up multi-boot USB devices,
to use a Pi as your daily driver, and how the Emmabuntüs collective code a 3D game world, and reveal
code memory-secure systems in is distributing second-hand the tools for managing your
the programming language Rust. computers to communities in need. passwords from the command line.
ISSUE 285 ISSUE 284 ISSUE 283

February 2022 January 2021 December 2021
Product code: Product code: Product code:

LXFDB0285 LXFDB0284 LXFDB0283
In the magazine In the magazine In the magazine

Stay one step Discover how to We pit Ubuntu
ahead of the nefarious perpetrators turn your Raspberry Pi into an all- against Fedora to see which is the
of ransomware with our in-depth singing, all-dancing media hub. We better Gnome-based distro. Five
feature. We bring you tutorials on put a spotlight on video conversion filesystems are put through their
rock music effects, offline password tools, take you on a tour of Stacer, paces, we show how to run a Ghost
management and creating a virtual the one-stop system management blog, code a Galaxian-style shooter
network lab. Discover how to set up tool, and emulate the Oric-1 in Python, and use Okular to edit
a temperature display for your (thankfully without that keyboard). PDF files with ease.
Raspberry Pi and build web services Discover how to build a Pi-powered
with Go and the Gin framework. We NAS and learn more on how the DVD highlights
also put five of the best GUI-based world’s top-500 supercomputers all Ubuntu 21.10 and Devuan 4.0
backup tools through their paces. harness the power of Linux. “Chimaera” (both 64-bit only).
To order, visit www.magazinesdirect.com

Select Single Issues from the tab menu, then select Linux Format.
Or call the back issues hotline on 0330 333 1113
or +44 (0)330 333 1113 for overseas orders.
Quote the Product code shown above and have your credit or debit card details ready

UK readers
READING IN THE USA? turn to
p18
SUBSCRIBE!
Don’t wait for the latest issue to reach your local store –
subscribe today and let Linux Format fly straight to you.
Faster, cheaper and with DRM-free archive access!
3 GREAT
WAYS TO
SUBSCRIBE
Print, digita
l-only,
and print+d
igital
bundles!
USA REST OF THE WORLD EUROPE

From $132 From $132 From €100
For 13 issues For 13 issues For 13 issues
IT’S EASY TO SUBSCRIBE!

Visit www.magazinesdirect.com/linux-format
Call +44 0330 333 1113
Lines open Monday-Friday, 9am-5pm, UK time

TUTORIALS Smart home
Part Three
HOME ASSISTANT
Credit: www.home-assistant.io
Did you miss
parts one or
two? Turn to
Make your home

page 62
as smart as possible
Exploring NFC tags, energy monitoring and the Wireguard VPN to add
further capabilities to your smart home with Matthew Holder.
he previous two articles of
T this series introduced a

large number of concepts,
which are important in gaining an
understanding of how Home
OUR Assistant works and how devices
can integrate with it.
EXPERT Other items that have been
Matt Holder covered include using data from
has been a fan of entities in automations, adding users
the open source to the system, customising Lovelace
methodology for dashboards, adding hardware on
over two decades the local network and adding
and uses Linux integrations that pull in data from Energy monitoring dashboard, displaying electricity usage.
and other tools online sources.
where possible. This article will cover the Energy tracking dashboard Pi and it can then be switched on. Once completed the
in Home Assistant, how to use power-monitoring data activity light will flash a uniform pattern and if a HDMI
from smart plugs to create automations, which can alert cable is connected the screen will turn green.
you when appliances such as the washing machine or With this step completed, the Home Assistant image
dishwasher has completed a cycle. Also being covered can be written to the USB SSD. This can be done by
is the WireGuard VPN, which can be used to securely following the usual instructions, with special care being
access the system from outside of the home network, taken to select the correct device to write the image to.
and the usage of RFID tags, which can be scanned by a When booting from an SSD for the first time, Home
smartphone and used to trigger automations. Assistant will take the necessary steps to ensure that
As previously discussed, the Raspberry Pi is an space on the entire drive can be used. If being used
excellent device to run Home Assistant. However, the for a new installation, simply complete the welcome
unreliability of micro SD cards can let it down. It’s wizard. If replacing the Micro SD card of an existing
possible to boot the Raspberry Pi directly from an installation, then a recent backup file can be used to
SSD, which this author currently does. restore everything to its previous state.
More recent Raspberry Pi firmware makes direct
boot from USB possible for some models. This was Access when away from home
used with a USB SSD to enable Home Assistant to be There are a number of ways to access your installation
installed directly to the SSD – no Micro SD card was when outside of the home. The most insecure method is
needed. To configure this, a Micro SD card was written to open a port on your router that is directed to the
with the Bootloader>USB boot image file to configure device running the installation. Alternatively, you could
the Pi in the correct way. This can be written to the pay for a www.nabucasa.com subscription.
While a lot of SD card by using the Raspberry Pi Imager tool (www. The third option is to use a VPN to connect to your
configuration raspberrypi.com/software): under Operating System home network and then it can be accessed as if
takes place scroll down to Misc Utility Images and click to open the connected from home. There are plenty of options
using the GUI, next menu. From this menu, USB boot can be selected. available to choose from, including OpenVPN, WireGuard,
YAML is still The target device can then be selected (be careful Tailscale and ZeroTier. The WireGuard add-on is excellent.
required in that the correct device is selected because this It provides everything needed to set up the server and
places. See operation will wipe whichever device is chosen), client and will be covered below. WireGuard provides a
https://bit.ly/
followed by clicking the Write option. Once written, the VPN at layer two, and the IP address of the server and
lxf289-yaml-ha.
Micro SD card can then be inserted into the Raspberry client will need to be set manually. Clients exist for

Smart home TUTORIALS
Linux, Windows, iOS, Android and Mac OS. Some router be forwarded to the device running Home Assistant. This
firmware also contains support for the solution. differs for all brands of router, so DuckDuckGo will be
To be able to create a secure VPN connection your friend for this step. A static IP address will be the Visit www.
between the Home Assistant instance and another best option for the device running Home Assistant so mylocalbytes.
device, a few things need to be configured. First, the that there aren’t issues when the DHCP address com to buy
WireGuard add-on will need to be installed. To do so changes. Please note, that any port being forwarded smartplugs with
navigate to the Add-On store and install the WireGuard into your home network can be a security concern, even open source
add-on, making sure to set the Start at boot, Watchdog if being used with a VPN. A more secure method would firmware.
and Auto-update options. be to use Nabu Casa, but this is an option that requires
Start the add-on and then move on to the a paid subscription.
configuration. It’s likely that your home network has an
IP address range of something like 192.168.1.0/24. This Configure your client
means that there’s scope for 255 IP addresses on the The final step to getting the VPN fully configured is to
network, which should be fine for most. The WireGuard set up your client. For an Android phone, for example,
network will need a completely separate range to avoid download and install the WireGuard app from the play
any conflicts. The 172.27.66.0/24 range will be suitable store. From within the app, click the plus button and
in most cases and this is the range that will be select the option to start from scratch. Now, from within
described below. Part of the setup required for the VPN Home Assistant, open the Studio Code Server add-on,
is to configure a DNS server to use for the remote navigate to the SSL/Wireguard directory and open the
clients. This could be your home router, Google’s DNS client.conf file within the directory, which is named after
server or perhaps even an instance of AdGuard Home, the client being configured. Enter the details and then
which is another add-on that is available and can
provide DNS filtering to block ads and can support basic
filtering for other users in the household. TAKING THE TASMOTA ROUTE
Step two is to configure the “server” side of the
connection. Copy the below YAML into the configuration Tasmota is an open source project that provides alternative firmware
box of the Add-Ons configuration page and adjust the for ESP8366 and ESP32 devices. The project provides a way to run
text accordingly. firmware that ensures that all data is kept local to our networks. When
log_level: info installed, access is via a web browser, MQTT, web requests and serial.
server: The support for MQTT allows for very simple integration with Home
host: <DNSADDRESSHERE> Assistant. Upgrades are provided Over The Air (OTA) and are simple
addresses: to perform from the built-in web interface.
- 172.27.66.1 Support is provided for a wide range of hardware and the Tuya-
dns: convert project can be used to reflash devices that are produced
- 1.1.1.1 by Tuya and are sold as rebranded devices across the world. Tuya-
- 1.0.0.1 convert supported devices will most likely use the Smart Life or Tuya
peers: Smart mobile apps for configuration of the pre-installed firmware.
- name: <DEVICENAME> It’s important to note that there can be serious safety issues when
addresses: considering reflashing any devices that are connected to mains
- 172.27.66.2 voltages. A safer option is to purchase devices pre-installed with
allowed_ips: [] the firmware, such as smartplugs (see Quick Tip, above). Tasmota
client_allowed_ips: [] has built-in support for GPIO pins (both analogue and digital),
The peers section of the YAML above refers to a displays, IR communication, I2C interface, lighting of different types,
client and as many of these can exist as required. For temperature sensors, RF communication, Bluetooth and much more.
each of the peers configuration is generated. Each peer
or client needs an IP address assigned to it as well as a
name. The allowed_ips and client_allowed_ips section
provides a way of restricting IP ranges that the client
can access and vice versa. These can be left blank to
allow access to and from all devices. The server section
of the configuration requires an IP address to be set and
this needs to be on the same range as the clients. DNS
refers to the DNS server used and can be your home
router. Finally, the host section refers to an address that
can be used to reach the installation from the internet.
Assuming a dynamic IP is provided by your ISP, there
are multiple services that enable a client to report to a
web-based service and this can then provide a DNS
address to a changing IP. With this configured, the
next stage is to restart the add-on. This will force the
container to build a new config for any new peers that Tasmota MQTT
configuration
don’t currently have the relevant information available. (left) and
Before configuring the client, port forwarding will status page
need to be configured on your router so that traffic (right).
destined for your DNS name can arrive at the router and

TUTORIALS Smart home
sources, is displayed. This can be shown for various

time periods including the current day, week, month
and year. While the cost of energy usage can be
displayed, currently there’s no option to add a daily
standing charge as well as cost per unit, which can
make UK usage of this feature a little tricky. Gas
consumption can also be tracked, but this depends on
the correct hardware/meter being present.
Energy monitoring dashboard

1 In this next part of the article a Tasmota-powered
smart plug will be configured and added into our
installation. Integrations do also exist for other brands,
such as TP-Link, but note that these may need to be
cloud-connected. This configuration will enable the plug
to be switched on and off from an automation as well as
the energy being used to be stored and automations
fired based on the values.
The first stage is to add the device to the wireless
network and therefore Home Assistant. Once the smart
plug has been plugged in, wait for a minute or two and
then connect to the Wi-Fi network that it provides. Open
a web browser and visit the captive portal provided by
Home Assistant
entities related save the config in the WireGuard app. To test all is Tasmota. Follow the setup wizard and set the details of
to the Tasmota- working well, switch off the Wi-Fi on your phone, switch your home network Wi-Fi SSID. The device will then
powered on the WireGuard VPN and connect to the internal IP connect to the network and report the new IP address.
smart plug. address of the Home Assistant server. If all has worked Swap Wi-Fi network and visit this IP address.
well, the Home Assistant interface will load. This method The next stage is to configure MQTT, so that
can be used to connect from a browser or the mobile Home Assistant can integrate as needed. Visit the
app. When using this method, by default all web traffic Configuration page, select MQTT and then enter the
on the phone will use DNS provided by your home IP address of the Home Assistant installation and the
connection. The Android app and perhaps others username and password setup for MQTT specifically
too can be configured to only pass traffic from certain (see boxout, below for further details). Other options can
apps through the VPN. be left as default. The smart plug will then communicate
In the past nine months or so an energy tracking with Home Assistant and it will be reported, under the
dashboard has been added to Home Assistant. This Integrations section of the Configuration page, that a
provides support for the tracking of entities that supply new device is available. Follow the wizard to adopt this
data with units of kiloWatt hour (kWh). Support also device. The relevant entities will be added automatically.
exists for solar generation and battery energy storage
MQTT configuration
and the net energy usage, taking into account multiple
2 Using the device page, linked to from the
Tasmota integration’s tile, the relevant entities can be
CONFIGURING MQTT seen and the relay in the smart plug can be switched on
and off. The current, voltage and energy usage will also
MQTT stands for Message Queuing Telemetry Transport and is a be displayed. An entity will also be provided with the unit
messaging service that can be accessed by a wide range of hardware. of kWh and this can be added to the energy-tracking
Libraries exist for devices all the way from x86 to microcontroller section of the configuration. During testing, the data
boards. The messaging protocol requires very little processing power provided from Tasmota didn’t seem to be reported to
and a tiny amount of bandwidth. Home Assistant. The issue here was that, by default,
MQTT operates as a publish-subscribe system. An MQTT broker Tasmota will only send data, via MQTT, every five
runs somewhere on the network, which devices can publish to. Other minutes. This can be changed: access the Console
devices then subscribe to the broker and are able to act when certain option within the smart plug’s web-interface and enter
messages are received. The recommended broker to use for Home TelePeriod 30
Assistant is called Mosquito and can be installed from the Add-On which will change the reporting interval to 30 seconds.
store (Configuration>Add-Ons, Backups and Supervisor).
Tasmota-powered Smart Plug
Once installed, navigate to the users section of the configuration
and add a new user for MQTT. This can be a limited user who doesn’t 3 An automation can now be created using a
need to be an administrator, and can be set to allow access from the helper and the power usage of the device to determine
internal network only. Now that the MQTT add-on has been installed, when a device starts and stops. For example, this can be
head to the Integrations page within Configuration and configure the used to alert us when the washing machine cycle has
MQTT integration which has been discovered. The hardware we’ll be finished. In the Configuration>Automations and Scenes
discussing in this article can then easily be added to the system. The section add a Helper of type, Dropdown, call it DEVICE_
Home Assistant team has developed a standard so that devices can STATUS and add options of InUse and NotInUse . This
automatically be added, when certain messages are received. will then create an entity called input_select.DEVICE_
STATUS. Two automations will be used for this and the

Smart home TUTORIALS
first will detect when the power consumption rises for a albums, based on which tag is scanned. Imagine a book
number of seconds and it will then set the value of the of album covers, each containing an NFC tag. Tags can
Helper to InUse . The second automation will fire when also use QR codes, so experiment with these before NFC tags can be
the power consumption drops to a low value for a purchasing NFC tags as this may be as convenient. used to interact
number of seconds and will use a condition of the To create a QR code, navigate to Configuration>Tags with Home
Helper being set to InUse . When this second >Add Tag and give the tag a name. Once generated, the Assistant using
automation fires, the value of the helper can be set back QR code will be shown in the list and when the cog icon the phone app
www.home-
to NotInUse and then a notification sent to Telegram or is selected a QR code will show, which can be printed
assistant.io/
a Google Home/Nest device – see last month’s article and used anywhere around the home. An automation
blog/2020
for further details about verbal and textual notifications. can be created by clicking the icon of the Android, next /09/15/home-
Create the first automation and set the Trigger to be to the newly created QR code. When scanned, the QR assistant-tags/
of type Numeric State. Add the relevant entity, which will code will call a URL within the Home Assistant system,
be something like sensor.tasmota_energy_power. Set which will trigger the relevant Automation.
the For box to be 30 seconds. In the Above box, set a For this example, a notification will be sent to a
realistic value, such as 20. Set the condition to use the registered Google Nest device. When creating the
value of helper being set to NotInUse . In the Actions Automation in this manner, the trigger section is
section set the Action type to Call service, the service to already populated. Add any conditions and set an Action
Input select: Select and the entity to the relevant Helper. to call a service and assuming that last month’s tutorial
The Option box can be changed to InUse . has been followed, add the service type to be tts.
Create the second automation and set the Trigger to google_translate_say. In the Entity box select the
be of type Numeric State. Add the relevant entity, which relevant device and add a relevant message. Save
will be something like sensor.tasmota_energy_power the automation and then scan the QR code. Home
and set the For box to be 30 seconds. Set the Below box Assistant will then perform its magic and the automation
to be a reasonable value, such as 3. Set the condition to will fire and the message will be audible from the
use the value of helper being set to InUse . Under the relevant speaker.
Actions section, set the helper value to be changed to This is the final article in the series on Home Assistant
NotInUse . Now you can either set a further action to itself. There have been a lot of concepts introduced over
notify Telegram/Google Home/Nest device that the the past three issues, but this will hopefully have given a
device is no longer operating or, if you want to place good grounding into such a large project. Hopefully now
further conditions on when the notification is sent, you’ll find it straightforward to develop your own ideas
create a third automation with a Trigger of the Helper into captured data and automations.
changing from InUse to NotInUse with Conditions In the following two issues, projects will be discussed
containing the times that the automation should fire. that integrate nicely with Home Assistant. The first is
ESPHome (also developed under the NabuCasa
Automation debugging
4 NFC has revolutionised a number of industries
umbrella) and this provides a way of generating
firmware for small microcontroller devices, such as
from payments to file transfers to retail. RFID tags are the ESP8266 and ESP32 devices. This allows for
even used by some Bluetooth peripherals. With a “satellite” data collection devices to send data to the
smartphone or standalone reader these tags can also central Home Assistant server. The second article Using the clock
be used with Home Assistant. Tags are programmed will cover WLED, which is used to install on a icon next to each
automation,
and automatically registered with Home Assistant microcontroller board and provide a way of controlling
it is simple to
and automations can then be fired when devices are individually addressable sets of multi-colour LEDs. See troubleshoot
scanned. These tags can be used to arm an alarm, you next month! any problems.
send notifications, start timers and more.
The first step to using tags is to decide which ones
to buy. This author has used fairly basic MiFare tags
before, but before heading to your favourite online
marketplace, check which your chosen device supports.
It’s also possible to make your own standalone reader
using a PN532 circuit board and microcontroller
(https://github.com/adonno/tagreader).
Install the Home Assistant app from the app store and
register with your installation. When your new tags
arrive, make sure NFC is enabled on your phone and
open the Home Assistant app. Open the Configurations>
Tags option and add a tag. Give it a descriptive name,
select Create and Write and scan the tag. This will then
register the tag and when scanned a URL is visited in
Home Assistant, which can then be used. For example,
there could be a tag by the TV, so that when scanned, if
the sun has set, an evening scene can be activated to
dim the lights. Tags could also be used to play certain
HOW TO AUTOMATE LXF…Subscribe now at http://bit.ly/LinuxFormat

TUTORIALS Running Wine
WINE
Credit: www.winehq.org
Get more from

Wine and Windows
Michael Reed teaches you everything you need to know about using
Microsoft Windows compatibility system WINE with some handy tips.
ine enables the Linux user to run software that
W was designed to run under Windows directly on

the Linux desktop. Wine stands for Wine Is Not
An Emulator, and that gives some clue as to how it
works. Rather than emulating a PC, as is the case with
OUR a virtual machine, Wine remaps the calls made by
Windows software to equivalent Linux calls. This means
EXPERT that the Windows application is, effectively, running
Michael Reed natively on Linux. The advantages of this approach, as
has Wined and opposed to virtualisation, are that fewer resources are
dined almost consumed, performance is improved and Windows
every popular applications run seamlessly on the Linux desktop.
Linux distro
out there. What Installing the latest Wine
a smoothie. The standard Wine package in the repository of most
Linux distributions is Wine Stable, and this is the branch
that most users are looking for. Development is a more
up-to-date branch and Staging is the branch that
contains experimental patches and new features.
Generally, you’d only use those last two if you knew for
sure that you needed a bug fix or feature that was only
available in either of those branches.
On Ubuntu, for example, Wine Stable can be installed
by typing $ sudo apt install wine . At time of writing, the Our first port of call here is setting the font size by altering the Screen
Ubuntu version was a bit out of date, so we followed the resolution setting.
instructions on the Wine website (https://wiki.winehq.
org/Download) to install a more recent version. In the the required files from the internet. In those cases, the
case of Fedora, things were a bit more current, so we executable can be run by navigating to the directory
used the version in the official repositories instead. in a terminal using the cd command and running the
following command:
Windows Software, EEK! $ wine [name and path of executable]
The installation procedure for most Windows software is In the case of applications and games that have an
different to that of most Linux software. Typically, one installer, upon completion of the installation process,
There’s never a
locates the desired software on the web, downloads an Wine should add them to the Linux system to be
good reason to
installer executable and then runs that. Often, the launched in the same way as other Linux programs.
run Wine with
root privileges. program itself requires additional resources such as We’ll work with an example that uses Notepad++, a
Doing so will DLL (Dynamically Linked Libraries) files and additional popular Windows text editor. Having located the website
open up your components, which the user has to locate and install. (https://notepad-plus-plus.org), we downloaded the
Linux system Alternatively, some Windows software, particularly older, installation executable. Once Wine is installed it’s usually
up to security commercial software, is installed via a medium such as possible to run Windows executables by double-clicking
and stability a CD-ROM. Some smaller utilities are distributed in a them, but it’s often worth running them from the
risks, and .zip file to be extracted into a directory of your choice. command line terminal so that you get some feedback
confuse your The starting point for the installation of most if there’s a problem. We navigated to the download
configuration
Windows software is to run a setup program, which can directory and then ran $ wine npp.8.3.2.Installer.x64.exe
file privileges.
either contain the entire application or game or fetch to run the installer executable.

Running Wine TUTORIALS
We didn’t have to do much to complete the

installation. We simply accepted the licence agreement
and the default selections for optional plugins. We
also accepted the default suggestion for installation
directory, and it’s worth taking a closer look at what this
means. Microsoft operating systems such as Windows
have always labelled hard drive partitions with a letter.
This is incompatible with the Linux filesystem layout, so
Wine creates a virtual drive C in a directory called
drive_c within the directory hidden directory .wine
within the user’s home directory.
Wine Prefixes
Wine gives some scope for taking advantage of its
facilities for remapping directories by using the
wineprefix environment variable. If we had run
$ WINEPREFIX=~/wineprefixes/nppprefix wine ~/
Downloads/npp.8.3.2.Installer.x64.exe installed, a desktop shortcut is typically created along The command
then a complete Windows file system would have been with an icon within the Windows application launcher. ‘wine explorer’
launches a simple
created in the ~/wineprefixes/nppprefix directory Wine simulates a similar setup, but how this is file manager,
before running the executable. There’s no need to make presented to you depends on the desktop environment which gives you a
your custom prefixes hidden directories (with a dot at that you’re running. Most of the time, the application clear view of the
front of the name) just because Wine defaults to that. that you’ve installed should be available from within file layout that
Wine sees.
The prefix feature is ideal for situations in which you the application launcher of your chosen desktop
want to set up a separate Wine environment with its own environment alongside your native Linux software.
settings and support files for a program or a type of In addition, a .desktop file is placed in the ~/Desktop
program such as games. Each prefix directory has its directory. This is a text-based file that’s sometimes
own configuration. You can browse the files within a worth examining in a text editor if you need to find out
prefix in the normal way by navigating your file manager where the program is located or how it’s launched.
to the prefix subdirectory, be it in the default ~/.wine
subdirectory or that of a prefix you created. Command Line
You can even place a Wine prefix on a completely Some Windows programs, such as some games, require
Some Windows
separate drive. For example, you may have a speedy command line flags to be passed to them. To do this,
programs come
SSD as your boot drive coupled with a larger navigate to the directory containing the executable and in the form
mechanical drive. To make a given prefix the default one, then pass the command flags at the end of the Wine of .msi files,
export the WINEPREFIX variable by adding a line to command. To discover the location and name of the which aren’t
your .bashrc in your home directory such as: executable of an installed Windows program, load the executables.
export WINEPREFIX=~/ext_drive/WindowsGames associated .desktop file from your ~/Desktop/ directory To run these
and look at the exec and StartupWMClass fields. installers under
Running Windows Programs If you had a game executable called game.exe and Wine use the
Once an application is installed, it should function as a you needed to pass the flag -disablenetworking to it, wine start
[name of .msi
normal Linux application in terms of how you access it. you would navigate to that directory from within a
file] command.
On a real Windows system, once an application is terminal and type:
ALTERNATIVES TO WINE
The most obvious alternative to running and resource hungry in themselves. compatibility are better under Wine
a Windows application or game under For playing video games, it’s a toss-up because the intensive hardware
Wine is to use a virtualiser such as as to whether performance and requirements that games require
VirtualBox or VMWare. Virtualisers such expose the weaknesses of virtualisers.
as these emulate the hardware of an In addition, in many cases a virtualiser
entire PC and can run Windows. In some is unable to expose as extensive a
cases, this gives a better chance of selection of graphics card facilities
running an application successfully as Wine.
because you’re technically running the Wine has been made possible due to
application under the operating system the fact the Windows API (Application
that it was designed for. Programming Interface) is well
In addition, aspects such as DRM can documented. ReactOS (https://reactos.
throw a spanner in the works when it org) takes things a step further by
comes to compatibility through Wine. reimplementing not only the Windows
You lose a lot of the integration API, but also implementing a Windows-
convenience of running an application compatible operating system and has
under Wine, and VMs are cumbersome ReactOS running in a VirtualBox virtual machine. taken great strides in recent years!

TUTORIALS Running Wine
$ wine game.exe -disableworking that area of your system. Drive z: is linked to the root of
Remember that Windows applications make use the Linux filesystem, but with the same access
Note that Wine’s of a single dash character before a non-abbreviated privileges as a normal user. You can safely remove this
prefixes don’t command line flag, unlike Linux tools that would use a drive, but you’ll no longer be able to access Linux files
really constitute double dash instead. outside of the given Wine prefix.
a sandbox, Typically, you’ll end up trying a few different things
as such, before you find a command line sequence that correctly Winetricks
because Wine configures a Windows game. Going back to the .desktop Winetricks is a helper script that has different facilities
applications file, you’ll notice that it actually launches the desktop for improving the experience of running Windows
can still access link within the emulated Windows file system rather programs under Wine. It’s usually installed along with
the Linux
than running the executable file itself. Like a lot of Wine, but if not, search for it in the package manager.
environment.
Windows resources, these links aren’t flat text files. For Typically, when you run a specific Winetricks option it
this reason, although you can alter the link to add the will install libraries and other program resources under
command line option, it’s often easier to create a Bash the currently selected Wine prefix. Therefore, all
script. For example, you might create a launcher script programs that run from that prefix will benefit from the
in a text editor along the lines of: resources you added with Winetricks. Most Winetricks
cd ~/.wine/dosdevices/c:/Program Files/GreatGame/ usage examples run from the command line, but if you
wine greatgame.exe -skipintro run Winetricks without any command line options, it’ll
Save it with a .sh extension. You can leave it in your launch into a GUI. From here, you can browse through
home directory for easy access, but we like the location its various options to start building up a picture of what
of ~/.local/bin/ for user scripts because they’re Winetricks is capable of.
available from any location, they are backed up with Winetricks comes into its own when fetching and
backups of your home directory and root access isn’t installing resources needed to get programs working.
needed to create or edit them. It’s even possible that Windows users would regard
Just remember to run $ chmod +x [name of Winetricks with envy because they’re used to having to
script] on it to make it executable. hunt down packages by hand, downloading from what
they hope is a safe website and installing them manually.
Configuring Wine In many cases, you can find out what Winetricks
Rather than using text-based configuration files, Wine command sequence is needed by Windows programs
breaks with Linux tradition by storing configuration by searching the Wine Application Database (see box,
details in a binary file called the registry, a technological opposite). As a simple example, one of the first things
approach that it shares with Microsoft Windows. If you many users do to improve the look of Windows
find a tip for getting a specific program running that applications is to install the Corefonts package to their
involves editing the registry, you can invoke the registry Wine prefix. To do this, run the following command:
editor by typing wine regedit . However, most $ winetricks corefonts .
configuration of Wine is carried out using a GUI utility As often happens with Winetricks, this script takes
called Winecfg. If you run winecfg from the command a long time to complete, but it does hunt down the
line or an application launcher, it edits the configuration individual files that are needed and install them.
located in the default Wine prefix. It’s common to take Naturally, you can use a custom prefix with the
advantage of that fact when creating a new prefix. You Winetricks command so that you can have different
could create a prefix just for games by typing resources available to different setups on your system, a
$ WINEPREFIX=~/WindowsGames winecfg difficult thing to set up on a real Windows system.
Next, you’d place WINEPREFIX=~/WindowsGames As an alternative to using the GUI, type $ winetricks
before a command that launched the given Windows dlls list to get a list of all of the DLLs and frameworks
application. It’s usually worth the hassle of creating that Winetricks can download and install, a useful
separate prefixes for categories such as games. For one starting point if a program says it can’t find something.
thing, it means that you can back up your Windows For example, if a program complained that it couldn’t
programs and carry them between different Linux find a DLL relating to Visual Basic, you could type:
installations without having to reinstall them every time. $ winetricks dlls list | grep -i “visual basic”
The default font size tends to be a bit unpredictable for a case-insensitive search of the complete list. Type
when running Windows applications. This is something winetricks list for a list of all categories of things that
you can check and adjust by running Winecfg. Under the Winetricks can install.
Graphics tab, alter the ‘Screen resolution’ slider until the
example text provided is of comfortable size. Click Apply
or OK when you’re happy with your selection, but you’ll
have to restart Winecfg or running Windows software to
fully test out the selection.
As we mentioned earlier, by default, Wine sets up a
directory (~/.wine/drive_c) that simulates the C: drive
of a Windows system, and you can add extra drives
under the Drives tab of Winecfg. This is handy for
directories that you want to have within easy reach
of your Windows applications and games.
A word of warning here: every time you add a drive, Notepad++ uses a fairly typical Windows installer executable.
you’re potentially giving Windows programs access to In this case, we largely accepted the defaults and kept clicking Next.

Running Wine TUTORIALS
SOFTWARE COMPATIBILITY
The Wine Project hosts a database where users can report their
experiences running applications and games under Wine (https://
appdb.winehq.org). In particular, it’s important to check the database
if you’re considering investing money in a Windows program. Even if a
program appears to launch properly when run under Wine, it’s worth
checking to see if there are any gotchas in store when you try to
access certain features.
The Winetricks GUI version is a good way to acquaint yourself with
Some reports feature tips and tricks to get the program going,
what it can do and browse its features. depending on the specific version too, and it’s well worth expanding
the Comments and How To/Notes sections at the bottom of the page
To investigate installing Windows games, we started for extra information about getting programs working.
with Fallout Tactics: Brotherhood of Steel (2001), which If you’re having difficulties running a particular program,
we purchased from the Good Old Games website (www. particularly one of an older vintage, it’s sometimes worth causing
gog.com). Good Old Games makes an effort to provide Wine to simulate an older, 32-bit version of Windows. Consider the
the games with the copy protection and DRM (digital following command
rights management) removed, and this is welcome on sequence:
Linux because DRM often causes more headaches than $ WINEARCH=win32
any other issue when running games under Wine. In WINEPREFIX=~/wine32
fact, ancient DRM systems often prevent older Windows winecfg
games from running on newer versions of Windows. This creates a new prefix
In the case of that particular site, it’s often possible called wine32 in the home
to download a .zip file containing the files for a given directory and specifies that
game. In this case we could only find an .exe installer. this prefix should be
Our experience with the GOG installer has been that it configured to simulate a
generally works under Wine, but tends to throw up the 32-bit version of Windows
odd error. Game installers often want to install various and then launches Winecfg.
extra resources, adding Lord-knows-what to the system Subsequently, it’s possible
– a fact of life that Windows users just have to learn to to select an older version of
live with – and this makes using a Wine prefix a good Windows, such as Windows
idea for games. Selecting a 32-bit prefix and then selecting an 95 under the Applications
We started by creating a Wine prefix on an older, earlier version of Windows in Winecfg. tab in Winecfg.
secondary hard drive to save space on our boot drive,
and then we launched the GOG installer for the game:
$ WINEPREFIX=~/olddrive/WinGames wine What we ended up with was a startup script that
setup_fallout_tactics_2.1.0.12.exe looked like this:
This installation took quite a while, and at one point, cd ~/olddrive/data/WindowsGames/drive_c/GOG/
another window popped up requesting to install some FalloutTactics/
Microsoft support files, which we allowed it to do. As WINEPREFIX=~/olddrive/data/WindowsGames/ BOS.
ever, we simply clicked OK when the Good Old Games exe
installer threw up some errors, with no obvious ill- Given the tactical nature of the game, it was worth
effects. A tip we can offer you here is to change the experimenting with running it in a window. Because it
default suggestions for installation directories as wasn’t an in-game option, we ran $ WINEPREFIX=~/
Windows installers love to add spaces to filenames, olddrive/data/WindowsGames/ winecfg and selected
which can be awkward to deal with. ‘Emulate a virtual desktop’ under the Graphics tab. This
One problem with installing a game to a custom runs full screen Windows applications in a window. In
prefix is that the launch icon isn’t added to the launcher our experience, setting the game resolution in the game
of the desktop environment. If you think about it, there’s itself overrides the resolution you’ve selected in this
no way it could because custom prefixes enable you to dialog, so don’t worry about getting an exact match.
install more than one version of a program at once. This
gave us some extra hassle of having to navigate to the Stop wineing
installation directory within the custom prefix we’d set Hopefully, we’ve given you an introduction to the basics
up. Once we in there, we ran: of operating Wine. It can sometimes require a bit of
$ WINEPREFIX=~/olddrive/WinGames wine FOT_ experimentation to get a Windows program working,
HiRes_Patch.exe and of course, it’s always better to use a real Linux
to apply the high-resolution patch that Good Old Games program that does the same thing, if it’s available.
provided with the game. It was smooth running from However, thanks to features like Wine’s prefixes and the
there on, and we found that a resolution of 1,280x768 Winetricks script, Wine can sometimes make working
provided the best compromise of graphics size while with Windows applications and games more organised
fitting on a modern, 22-inch monitor. than real Windows does.
USE OUR INCOMPATIBLE SYSTEM…Subscribe now at http://bit.ly/LinuxFormat

TUTORIALS LXF server
RAINLOOP
Credit: www.rainloop.net
Take full control

over your email
David Rutland does the impossible and sets up a VPS-based email server
and a webmail front-end, then writes a tutorial about it – all in one afternoon.
mail is the king of online communication. Even provider and carry on as normal.
E today, with alternatives including an array of

messaging services, video platforms, Slack,
As this article is being written, the inhabitants of a
large, supposedly European country have lost access to
and of course, the ‘Tok, email is where it’s at if you want Instagram, and it looks likely that both WhatsApp and
a secure, reliable, platform through which you can Facebook Messenger will follow suit. It’s impossible to
OUR contact anyone in the world.
Signal, Telegram and WhatsApp are ideal for organising
know what will happen with the Telegram and Signal
services, but we can practically guarantee that the email
EXPERT a night out, but problems arise when one friend uses network will continue to function even if the countries
David Rutland Facebook Messenger, two are on Signal, and there are a involved no longer exist.
hasn’t moved for couple of revenants from the 1990s who refuse to use
the past four anything more up to date than their own IRC chatroom. Who’s reading your mail?
hours. He’s Messages need to be relayed to everyone in the We’ve established that email is fantastic, reliable and
drenched in a friend group, and getting anything done relies on some the only sensible way to send messages if you want
pool of his own members having access to more than one services and them to be received by everyone. But for most people it
sweat and in acting as an intermediary. Honestly, it would be quicker isn’t exactly private, and the ability to use their email
need of a cuppa. and easier to deliver RSVP invitations by carrier pigeon. account to communicate with others exists at the whim
Email isn’t like that. Anyone with an email address of a corporation that has a nasty habit of shutting down
can send messages, GIFs, audio clips and top-secret services and changing the terms and conditions of use.
documents to those with an email address. Fastmail Around two billion people have Gmail accounts in
RainLoop is a doesn’t prevent you from interacting with people who 2022. That means that around one-quarter of the
pleasure to use, prefer Outlook, and even if Google is your data-slurping people alive on our planet have their mail routinely
and unlike a
client such as
behemoth of choice, you can still use Gmail to send scanned and mined for details of their personal and
Thunderbird you messages to your Apple-crunching friends. professional lives. Such information is worth money.
can access it Email is also insanely resilient. If Telegram goes offline Google claims it stopped scanning emails for
from anywhere. or is banned in your country, tough luck – you’ve lost advertising purposes (we may or may not believe them)
Remember to
contact with all of your Telegram buds. If you lose access in 2019, but it still has its AI read through your ramblings
change the default
login credentials. to Gmail for some reason, you can just pick another for other purposes. Read the terms and conditions
some time – they’re about what you would expect.
Any email account, whether free or paid, is prone to
surveillance for either commercial or legal purposes.
Even ProtonMail – which vaunts its privacy credentials
and holds itself as a paragon of snoop-free virtue and
has long been regarded as the most secure and private
email service in the world – has admitted that it can be
compelled to log activity and IP addresses to assist
police with their enquiries.
If you use email in the hope that your
communications are private, by relying on a third party
to provide the service for you, then you’ve already lost.
Email isn’t that hard

Setting up your own email server is a daunting task.
Visit any self-hosting community online and you’ll find
dozens of threads with people asking for help, only to be
shut down by users saying not to bother. “It’s too

LXF server TUTORIALS
difficult,” they say. “You can’t secure

it properly,” chimes in somebody
else. “Your mail won’t reliably get
through,” they add.
Such doom-sayers aren’t entirely
wrong. This
writer’s main email address is on a
server running on a Raspberry Pi
behind his couch, and took around a
week to get working properly. It
wasn’t easy. A previous email-based
tutorial was aborted after turning
into a solid 3,000-word block of
code.
A typical email server relies on a
few pieces of essential software:
Postfix, a free and open-source mail
transfer agent that routes and
delivers email; Dovecot, and open-
source IMAP and POP3 server, from
which email can be sent and retrieved using your <VirtualHost *:80> DNS TXT records
favourite email client; SpamAssassin to assassinate ServerName your.domain need to be set up
correctly to assure
spam (it’s in the name); and openDKIM, which helps DocumentRoot /var/www/your_domain/
receiving servers
assure other mail providers that your email server is </VirtualHost> that you aren’t a
who it says it is, and is authorised to send mail. Press Ctrl+O then Ctrl+X to save and exit. Next, do filthy spammer.
These components, while easy enough to install, the same for your mail subdomain, using mail.your.
require a great deal of configuration, and can easily domain instead: $ sudo a2ensite your.domain.conf
form the kernel of a severe migraine as you try to mail.your.domain.conf then restart Apache with:
work out what went wrong this time. $ sudo service apache2 restart
If you want to set a mail server the proper way, we Now $ sudo mkdir /var/www/your_domain and
suggest consulting Jonni Bidwell’s excellent tutorial $ sudo nano /var/www/your_domain/index.html and
Read our VPS
which featured in LXF284. If you want to get up and enter whatever text you want. At this point the content
features in
running as quickly as possible, read on... doesn’t matter. Again, Ctrl+O then Ctrl+X to save exit, LXF281 and
and then repeat for your mail subdomain. LXF282 at
Record keeping At this point you should be able to reach your root https://bit.ly/
Before we get started in the terminal, we need to set up domain and the mail subdomain using your browser. lxf281lxfserver
a few records. Head over to your registrar (Namecheap You won’t see the broken padlock or insecure warning, and https://
in our case) and set up a new A record with @ as the which lets you know that SSL isn’t enabled. bit.ly/
host and the IP address of your VPS as the value. You’ll Dive back into the terminal and sudo certbot. Answer lxf282lxfserver.
also need a record with mail as the host, and again, your
VPS IP as the value.
Further down, the email settings drop-down will likely USE YOUR EMAIL SERVER FOR MORE
be set to either no email or email forwarding. Find the
Custom MX entry and select it. Enter your @ as the host If you read through, rather than skipped, over the opening paragraphs
and mail.your.domain as the value. Set the priority as 10. of this tutorial, you’ll have learned something about this writer’s
Now you need to change the rDNS of your actual dislike of instant messaging services. When you use WhatsApp (just
VPS. This is the hostname that your server will give if as an example), the app on your phone is just a front-end to a massive
the IP address is queried, and assures receiving mail communications infrastructure, which comes with pitfalls around
servers that your email comes from a legitimate source. surveillance, confidentiality and lack of control. Whatsapp, which is
You can check the hostname revealed by rDNS. Visit really Facebook (aka Meta) in disguise, knows who you contact, when
https://dnschecker.org/reverse-dns.php, and type in you contact, and can probably make an educated guess as to what
your IP. You’ll need to change this, so that a reverse DNS you discuss. And then there’s the fact that you’re limited to contacting
query returns your domain name. For the Linux Format people within the WhatsApp network.
VPS this would be lxf.guru and not mail.lxf.guru. By using an app such as Delta Chat, your email server can take the
If you chose Digital Ocean as your VPS provider, place of instant messenger services, enabling you to communicate
changing the rDNS is as simple as renaming the instantly and easily with your buds. Delta Chat is essentially a
machine in the Digital Ocean dashboard. Records customised email client, with versions available for Linux, Android,
will be updated automatically. If you use another Windows, MacOS and iOS. Chats are automatically encrypted using
provider, check their help docs. Autocrypt, and the layout and functionality is instantly familiar to
Head back to the terminal and SSH in. You’re going anyone who’s used Telegram, WhatsApp or Signal. Photos, videos and
to create a configuration file so that Apache knows what voice messages can be taken from within Delta Chat, and because it
to do with the base domain (lxf.guru) and your mail uses the email backbone rather than a proprietary walled garden, you
server subdomain (mail.lxf.guru) can group-chat with whoever you please. Best of all, your messages
$ cd /etc/apache2/sites-available/ are on your server and your devices – and under your control.
and then: $ sudo nano your.domain.conf and enter:

TUTORIALS LXF server
the questions and select the domains for which you _dmarc.lxf.guru TXT v=DMARC1; p=reject;
want SSL certificates, and when prompted, choose rua=mailto:david@lxf.guru; fo=1
Set up different redirect to ensure that all HTTP traffic is redirected to This relates to the DMARC policies, and having a text
alias users HTTPS. Check that this has worked by visiting your record which states what should happen to emails
to give as an domains again and noting the presence of the tiny which supposedly arrive from your server but don’t pass
address to padlock in the URL bar. certain validation tests, means that your mail is more
shops, signups, likely to be successfully received.
and companies.
You’ll know
The easy bit... In this record, we have set instructions that if the
With the basic preparation out of the way, it’s time email doesn’t match our DKIM (Domain Keys Identified
who leaked,
when the for what would normally be the hard part – installing Mail) record and SPF (Sender Policy Framework), it’s to
address starts and configuring dovecot, postfix, openDKIM, and be rejected. Each email you send will cause the
catching spam, Spamassassin – but which, thanks to a handy receiving server to generate a DMARC report giving you
and can simply setup script, is now the super-easy part. its evaluation of your SPF and DKIM, and whether the
disable the user From your home directory, run: server is inclined to let your mail through or not.
when you no $ curl -LO lukesmith.xyz/emailwiz.sh You probably don’t need to read these reports, but
longer need If you want to see what the script does, and ensure that it’s good to be able to see if anything is going wrong. If
the account. you’re not dumping a bunch of malware on to your you do want to read the DMARC reports, change the
virtual machine, $ cat emailwiz.sh and take a look. We’ve mailto address to one that you’ll actually use.
read through it, and can assure you that at the time of In our new DNS record, we set _dmarc.lxf.guru as the
writing, the script is exactly what it appears to be. host, TXT as the type and then
Make the script executable with $ sudo chmod +x v=DMARC1; p=reject; rua=mailto:david@lxf.guru; fo=1
emailwiz.sh , then run it with $ sudo ./emailwiz.sh . as the value.
Choose Internet Site as the general type of mail Note: depending on your registrar, you may need to
configuration, and for the System mail name, put your delete the .your.domain from the host field, and use
domain name, for example lxf.guru. _dmarc instead of _dmarc.lxf.guru . Repeat for the
You’ll find that there’s just enough time to make a other two records and save. That’s it. Your email server
cup of tea as the emailwiz script does it’s thing, and is set up and ready to roll.
when you return, you’ll should find a success message, Adding email accounts is as easy as creating a new
along with some ASCII art spelling out NOW in big red user in the terminal and adding them to the mail group.
ASCII letters. Below this, you’ll see three lines of text. If, for instance your name was Fred, and you wanted
9.2 is a poor These are records which need to be added on your an email account on your spanky new themost.fun
score and results
from the lxf.guru
registrar’s DNS page, so head back over there, and server, you would pop into the terminal and type
being less than a select ‘Add a new record’. $ sudo useradd -G mail -m fred
fortnight old. For one of our records, the emailwiz output gives us: Create a password with $ sudo passwd fred and
you’re good to go.
If the fred user already exists then add it to the mail
group with:
$ sudo usermod -a -G mail fred
Remember that you’ll need to log out and back in
again to see new group memberships.
You’ve got mail!

To actually send or receive mail you need an email client
or webmail app. You may already have a favourite email
client, or if not, the odds are high that there’s already a
copy of Thunderbird hidden away on your system.
To get it up and running with your new email address
and server, launch it and select Add Account. Fill in your
name, email address and password, then click Configure
Manually. For the incoming server choose IMAP; the
DON’T BE A SPAMMER
Official sources state that as of March being used as spam palaces by ne’er-do- both hourly sending limits and hourly
2022, spam emails constitute around wells. Gmail, for instance, will prevent BCC sending limits.
3,000 per cent of all internet traffic – you from adding more than 500 When you run your own email server,
encouraging users to purchase recipients for a single email and sending there are no such limits. You can send to
industrial-strength Indian Cialis and a more than 500 emails in a single day. If thousands of people at the same time if
range of other drugs, presumably to use you violate these limits then your Gmail you so wish. You can probably get away
while cavorting with all of the sexy account will be temporarily blocked, and with this exactly once before your
singles in our neighbourhood. if you repeatedly break the rules, you domain and IP address are blacklisted,
Large email providers take measures may lose your Google account entirely. meaning that you’ll never be able to have
to limit accounts on their servers from ProtonMail limits are even tighter, with anyone read your emails ever again.

LXF server TUTORIALS
server will be mail.your.domain. Choose SSL/TLS on Using an encrypted

993. The username is your username. email frontend
like Delta Chat
For the outgoing server choose SMTP; the server will
gives you all of
be mail.your.domain. Choose STARTTLS on 587. The the ease-of-use
username is your username. of a messenger
Test the settings, and if everything is correct, then app, but without
congratulations on setting up your new email server in the walled garden
and with your
under an hour! messages under
But this tutorial series is all about getting the most your control.
out of your VPS and it would be remiss of us if we failed
to provide you with VPS-hosted webmail so that you can
retrieve your newsletters and chain mails from your
grandma on any machine with a browser.
For our webmail we’ll be using RainLoop, which is a
good-looking app. It supports drag and drop, is easily
customisable, and even integrates with Facebook,
Google, Twitter and Dropbox – if that’s your bag.
Remember the DocumentRoot you specified in your
mail.your.domain.conf earlier? Head over there with:
$ cd /var/www/mail_your_domain/
Remove the file you created:
$ sudo rm index.html
then type the following:
$ sudo wget https://www.rainloop.net/repository/
$ webmail/rainloop-latest.zip
unzip the package
$ sudo unzip rainloop-latest.zip
You’ll need to set the correct permissions:
$ sudo find . -type d -exec chmod 755 {} \;
$ sudo find . -type f -exec chmod 644 {} \;
And recursively set your apache user as owner for
the application:
$ sudo chown -R www-data:www-data .
Now visit your mail.your.domain/?admin and you’ll
be greeted with a login page. Hopefully no-one has
managed to get there before you because the default
login is admin, and the password is 12345.
Immediately after login, you’ll be prompted to
change the password. While you can ignore this prompt,
you absolutely should not. Email reputation is a funny thing, and if any part of
With basic security out of the way, you can set up your configuration is incorrect it can land you on a email
RainLoop to interact with your email server. Locate blacklist, from which you’ll find it difficult and time-
Domains on the left hand menu, then click Add Domain. consuming to escape.
A pop-up menu will appear asking you to fill in the Visit www.mail-tester.com and you will be given a
details. Fill them in exactly as we described for the unique address to which you can send an email for it to
Thunderbird setup above. be evaluated. Copy the address down, and carefully
While you’re in the admin panel, you can configure compose an email to send to that address. Send it, then
various other options such as the server name, the refresh the mail-tester page.
login and loading text, and set favicons. If everything You should receive a 10/10 score. Anything less than
is to your satisfaction, navigate to mail.your.domain that isn’t great, and even a 10/10 doesn’t guarantee Unless you’ve
encrypted your
and log in. that your mail will get through.
server, all of
The layout is simple and easy to understand, with the The email server at lxf.guru received a paltry 9.2/10,
your emails
usual sent, received, spam, drafts and trash folders on and further investigation revealed that although all of are stored in
the left. A message list is on the left side of the main our TXT records were correct, the DKIM signature was plain text. If an
pane, which makes it possible to see the sender, subject valid and neither the VPS IP nor the domain name was attacker gains
and date. On the right is the message preview. Clicking blacklisted, we were losing points because we registered access to your
a message in the list will cause the contents of the lxf.guru less than a fortnight before. server then
message to appear in the preview pane. You’ve used And with that, we were satisfied that the Linux Format they’ll be able
webmail before – we don’t need to tell you this. For the mail server was fully operational. Yours should be too – to read your
sake of completeness, clicking the green New Message and you didn’t even break a sweat. Now go and email emails and
those of
button enables you to draft a new message. But don’t your friends and relations, and tell them subscribe to
your users.
send one yet. your favourite Linux magazine!
ALLOW US TO SERVE YOU LXF…Subscribe now at http://bit.ly/LinuxFormat

TUTORIALS Virtual machines
MULTIPASS
Credit: https://multipass.run
Easily create instant

virtual machines
Stuart Burns helps you to master Multipass, the virtualisation
platform that runs on any desktop platform.
evelopers like to be able to launch virtual
D machines quickly for testing, but when

developers write code on different platforms it
can become a bit more complex to test if they have to
use different virtualisation stacks.
OUR Fortunately, Ubuntu provides a solution for quick,
disposable Ubuntu-based virtual machines on Intel-
EXPERT based machines, and it’s even supported on the new
Stuart Burns Mac M1 based devices (with a few limitations, naturally).
is a cloud- and This virtualisation software is called Multipass.
security-focused Multipass is basically a front-end tool to start virtual Basic command line used to deploy a Multipass virtual machine with
administrator machines, but it can support many varied back ends two CPU cores, 4GB of RAM and a 20GB hard disk.
specialising in including VirtualBox, LXD, KVM and others. Multipass is
large-scale virtual essentially an abstracted automation tool to create a found at https://multipass.run. Multipass comes
implementations. VM on the underlying hypervisor, which is why it can with both a command line and a rudimentary GUI to
work on most platforms because the underlying boot. We’re going to use the command line because it
hypervisor works on those platforms. offers a lot more flexibility. After Multipass installation
To install Multipass locally is straightforward. completes we’d strongly advise a reboot. Doing so will
Multipass on Linux does require snap to be installed first reload the configuration and start the GUI management
but that shouldn’t be a problem with most modern widget as well.
Linux distributions. Install it and confirm installation
using the commands below: First steps with Multipass
$ sudo snap install multipass To start using Multipass, open a terminal window and
$ sudo snap info multipass use the following command:
Instructions for Windows and Mac installation can be $ multipass launch
This command will download and create a new VM
with a dynamically generated name. It may take a few
moments to create a VM the first time, because it has
to download the base Ubuntu image.
By default, Multipass will use the latest Ubuntu server
image made available for Multipass use on the platform
it’s running on. There are additional optional VM base
images available, which are discussed later. This first
VM is special, and it’s marked as the primary instance.
As the name suggests, it’s important. Out of the box
(on Linux) the primary instance also mounts the users
home directory. It shows up in the VM as a folder called
home within the existing home folder, so files can be
accessed as though they were part of the normal
filesystem – so be careful what you remove or delete!
Additional virtual machines, however, don’t have this
facility, and require an additional multipass command:
$ multipass mount $HOME lfexample4 /home/home
An example of the console that can be accessed with the multipass shell command. It can be It’s possible to have several mounts on a VM and
treated like any other virtual machine. there’s no need to export the mount to a variable. You

Virtual machines TUTORIALS
can substitute paths instead of

variables – for example, the
$HOME could be Downloads to
just expose the Downloads folder to
the VM. Unmounting is done by
using the unmount command –
multipass umount lfexample4 /
home/home . The primary VM can
also be accessed by a GUI console
by going to the Multipass drop-down
and selecting ‘open shell’.
Other ways of getting an
interactive shell on the VM include
the Multipass shell command,which
the reader can use to run an
interactive BASH shell, like this:
$ multipass shell lfexample
This will open a console as
though the reader was sat directly
in front of the virtual machine. Installing the Multipass snap in Linux. Doing this via the command line gives you more options, compared to taking the GUI
Alternatively, a reader could set up route. Note that Multipass is only available as a snap install.
a user from the console and then be
able to SSH into it. Once inside the shell That’s because they use NAT (network address
the VM can be treated just like any other VM. All the translation) by default – in other words, in a private
usual commands are available. It’s literally a complete network that can reach the internet. They can also be Multipass often
VM image. For example, to install Apache, just use: seen and managed from the local workstation but by benefits from
$ sudo apt-get install apache2 default they’re invisible to everything else that’s on new features.
It will install just like any other Ubuntu server. Using a the network. One recent
browser to navigate to the virtual machines IP address In order to clean up the two examples we created addition is
should display the Apache default installation page. (and cover stopping and starting) there are a few a quick and
easy Docker
Obtaining a list of all running machines is multipass parameters to use ( $ multipass stop <vm
development
straightforward – just use: name> or $ multipass start <vm name> ). Once
environment. To
$ multipass list -all stopped, use the command $ multipass delete <vm_ deploy Docker
If the user doesn’t need to have an interactive shell, name> . It won’t ask for confirmation and will delete in Multipass
then another way to run a command and return the the virtual machine. To recover a deleted VM use just requires
information to the console is to use the exec option. $ multipass recover <deleted VM> . Alternatively, to multipass -c 2
For example, to obtain a configuration file, use purge the deleted VMs use $ multipass purge . -m 4G docker
$ multipass exec lfexample In summary, Multipass provides a way to docker and
automatically and speedily create disposable virtual there will be
Adjust system resources machines for testing. Rather than having to manually a docker host
installed to run
By default, Multipass can be rather modest in the recreate or redeploy a VM, it becomes as easy as one
containers in.
amount of RAM and CPU given to a new virtual command to launch a new VM that can also see the
machine by default: just one CPU core and 1GB of host filesystem if required.
RAM. Fortunately, it’s easy to override these defaults
and give the VM more resources, in this example we’ve
supplied it with 4GB RAM and two CPU cores. Note that ADVANCED ITEMS, MULTIPASS SET
it’s also possible to use these switches when creating
the primary VM if desired. options, including setting the VM to start automatically, selecting the
$ multipass launch -c 2 -m 4G –name lfexample2 hypervisor and advanced networking, are performed with the
The options should be easy to spot, with the -c multipass set command. More information on set can be found at
referring to CPU core count and -m for memory. The https://multipass.run/docs/set-command, but here we’ll cover a
memory does expect a unit of size after the number, be few useful shortcuts.
it k for Kilobytes, m for Megabytes and g for Gigabytes. One example is that under Linux only the LXD hypervisor permits
This same custom sizing is available using the -d for changing the network interfaces. Install LXD and all its requirements
disk sizing. To keep track of the created VMs, simply and then it becomes possible to use the different networks available
using multipass list will display its name, what’s within the virtualised environments. Change the hypervisor using the
running, its IP addresses and the OS that it’s running. command sudo multipass set local.driver="lxd" . Make sure all the VMs
For those following along and creating the two are stopped; this may require a reboot. Once the VMs are running on
example servers, to see more information about them LXD, to see the available network interfaces the VMs can utilise run
there’s the info parameter and its name, as shown multipass networks . To specify the VM to be launched is, use
below. This command will display the hardware and --network switch with the appropriate network name.
software details of the VMs: At the same time, the set parameter can be used to set the
$ Multipass info lfexample2 primary VM using multipass set client.primary-name=new_vm . Doing
Some more eagle-eyed readers may have noticed this makes the old one no longer the primary VM.
that the IP addresses are not on the local network.

IN-DEPTH All hands on Deck
ALL HANDS ON DECK

Jonni Bidwell pries Valve’s Steam Deck from PC Gamer’s cold,
anthropomorphised hands and gets his game on.
hen the Steam Client came the Steam Deck, Valve’s all-new Linux- means we can to meddle with it in the
W to Linux it was a watershed

moment for gaming. At the
time of its official release in
powered portable games machine.
This is undoubtedly one of the largest
developments Linux gaming has seen
same way we like to meddle with regular
Linux PCs.
So gather round the Deck’s crisp
January 2013, Linux gamers could run since the turn of the millennium. So 1,280x720 display and see how you can
some 50 titles, most of which were Valve naturally we were keen to get hold of the customise and tweak this marvel of
titles based on its Source engine. A year hardware and see what it’s capable of. The modern gaming. Also, it can do old games,
later, that number had risen to 300. Steam Deck is powered by the third edition DRM-free games and games that run in
Today, thanks to Valve’s Proton (a fork of SteamOS, which is based on Arch Linux. the terminal. And if you don’t like games
of Wine featuring a DirectX to Vulkan This gives it easy access to modern you can plug it into a dock and use it as a
transition layers), that number is over kernels, and the latest drivers for its (not regular Linux device and starting at £350
6,000. Driving this recent push has been inconsiderable) Zen 2 APU. This also it’s not even that expensive!.

All hands on Deck IN-DEPTH
ith the benefit of hindsight, it’s easy to see
W how Valve’s previous innovations and efforts

have informed the Steam Deck. First came
the Steam Machines, but that never really worked
out. Because who really wanted an overpriced gaming
PC (however stylish) in their front room? Attempts
were made to decouple the SteamOS operating
system from the Machines, so that it would become a
major league gaming distribution. That didn’t really
work either, since most Linux gamers were happy to
install Steam on their current distro.
The choice of Debian as a base for SteamOS seemed
reasonable from both a hardware and software stance.
But the need for new libraries meant SteamOS was
Debian Unstable with a custom kernel and various
userspace modifications. Not the kind of thing people
would want to be running as their daily driver. Maybe Ryan Gordon (aka icculus), Loki Software’s founder There are great
the plan should have been for Steam to work better on continued to be involved in Linux ports after the things to discover
in the app
Steam Machines than regular Linux. Anyway, let’s company’s demise. In particular, his work was
store. Flatseal,
continue the story of Valve’s hardware devices that instrumental to the early Humble Indie Bundles, for example,
should have done better. ensuring such diverse titles as Super Meat Boy and will help you
Then came the Steam Controller and the Steam Dungeon Defenders worked on Linux. wrangle Flatpak
Link, also part of the Steam Machines initiative. The permissions.
controller, with its unique haptic feedback and bounty Add a drop of Wine
of buttons/triggers/sticks, certainly had its fans – Later, porting houses like Aspyr and Feral Interactive
Linux Format among the most ardent – but it was would continue to bring big name titles to Linux (and
discontinued in 2019. The Steam Link, a low-powered MacOS), including the latter part of the Tomb Raider
box that could stream Steam titles from a PC (ideally series, Dirt Rally, Life is Strange, Mad Max and more.
a Steam Machine), hoped to bring gaming into every Outside these native Linux ports (and some classic
room, but again it never really caught on. However, open source games and engine reimplementations)
Valve did open source the code, so you can easily turn users’ only gaming recourse was to play Windows titles
a Raspberry Pi into a Steam Link. There are also apps through Wine.
available for mobile devices and smart TVs. Wine developers and the community put in a huge
The mid-2000s brought some notable games to collective effort (and we don’t want to know how long
Linux, including Doom 3 (which was open sourced last they spent staring at copious Wine debug messages)
year, RBDOOM3BFG) and Unreal Tournament 2004. to make this viable. See https://bit.ly/lxf289-fsckin-
Going back further there were other trailblazers too. wine to see how thorough people were. Today, lots of
Loki Software, founded in 1998, produced many ports titles will run through Wine without modification, and if
in its short lifespan, starting with Civilization: Call to not then Winetricks will help you wrangle runtime
Power and going on to do dozens more, including the libraries and .dll files without too much ado. In the past,
original Unreal Tournament, Myth II and Sim City 3000. it was not so simple.
PROTON AND PROTECTION PROBLEMS

Valve has put a huge number of human enchanted boots or whatever. Unless EAC has (at least) two different modes
hours into getting as many games as these mechanisms are adapted for Linux though: the incompatible, low trust
possible stamped with Playable or (more precisely Proton) then titles that kernel module approach, and a higher
Verified status. But even Verified titles rely on them won’t work. trust mode used by some less world-
may have glitches or aberrations. And if Different publishers have different dominating titles. This higher trust
you’d like to see them fixed then your attitudes about this. For example, some mode can be made to play nice with
best bet (as long as it’s a title that plays games using BattlEye will work just fine Proton, thanks to the EAC runtime
through Proton) is to report the issue at with Proton, if the developer has opted in. introduced with Proton 7.0.
https://github.com/ValveSoftware/ Epic Games’ Tim Sweeney has said that It’s easy for developers that use EAC in
Proton/issues. its Easy Anti-Cheat (EAC) technology, as their titles to flip a switch and get it
Conversely many games currently used in the rather popular title Fortnite, working with Proton. That’s how Apex
don’t work with Proton because of could be circumvented in Linux. Legends suddenly became verified. But
various anti-cheat technologies. On Tim explicitly mentioned custom hardcore EAC titles like Fortnite, Halo
Windows these often work by installing a kernels, presumably because a and Rainbow Six Siege won’t see official
kernel module that monitors either the hypothetical EAC kernel module Steam Deck Support anytime soon.
game’s process or its communication (ignoring for a second the difficulties There are a few ways to disable EAC on a
with game servers. This prevents third- involved in creating and licensing such a per-game basis, but doing this will
party cheats or hacks meddling with the thing) could easily be neutered by a launch titles in ‘offline mode’, which for
game and granting players high scores, homebrew effort. the likes of Fortnite isn’t much fun.

IN-DEPTH All hands on Deck
Now a brief historical aside. In 2012, when Valve was

doing its original Linux push (in which it made a native
OpenGL version of Left for Dead 2 that outperformed the
Windows version), Gabe Newell described Windows 8
as a ‘catastrophe’. He said that if Linux were better at
games then more people would make games for it. With
the L4D2 demo, he hoped Valve would help
In 2018 an exciting and seemingly unrelated project
appeared. DXVK could take DirectX 10 and 11 code, and
translate it into Vulkan, the new, close-to-the-metal,
graphics language that would supersede OpenGL and
compete with DirectX 12. This was much faster than We’d forgotten all about our Epic Games account. Now thanks to the
previous efforts that had to target OpenGL, and had the Heroic launcher we can play them (and GOG titles) on the Deck.
pleasing consequence that AAA title Nier:Automata
could be played on Linux, very close to native speed. been sponsored by Valve. DXVK, together with Valve’s
DXVK appeared to be the work of a lone developer, fork of Wine, would be at the heart of its new Proton
albeit a rather prolific one, inspired by D9VK (which did offering, which would bring a raft of new Windows titles
the same thing for DirectX 9). Soon the VKD3D project to Linux. Soon D9VK would be subsumed into DXVK
(for DirectX 12) appeared. And seemingly overnight we and, VKD3D (originally a Wine project) was picked up by
were looking down quadruple barrels ready to blast Valve after its founder passed away.
thousands of Windows titles onto Linux. That takes us up to 2020, where in LXF267 we really
Not all Window titles would survive should have probed Collabora’s Simon McVittie a little
the ballistics of this metaphor. But further about his and his employer’s work for Valve. He
pundits were amazed as DXVK talked about Pressure Vessel, essentially a container for
continued to add support for more Steam that enables titles (whether run natively or
titles. And then came the big reveal: through Proton) to be run in consistent environments.
the developer (Philip Rebohle) had Pressure Vessel is similar in design to Flatpak and, it
turns out, is instrumental to running games on Deck OS.
So to form an awkward shell expansion, if we take the
combination steam-{on linux, machines, controller}
throw in Proton and cook inside a Pressure Vessel until
there’s more Steam, then we almost have a roadmap to
the Steam Deck. Apart from the svelte form factor into
which these components are squished.
We can tongue in cheekily speculate where this came
from. The PC form factor was a non-event, a gaming
phone is clearly a daft idea and Valve already has a XR
project. This leaves a handheld as the only reasonable
course of action.
The Steam KDE-ck

There are plenty of devices out there running Linux that
don’t appear to be doing so at first glance. If you’d never
The KDE install is pretty spartan, but not so spartan as to not include some pleasing seen Android you wouldn’t know there was a Linux
backgrounds. Note that it uses PipeWire, too. kernel running underneath it. And the same is true for
ATOMIC UPDATES AND ENABLING READ-WRITE

Atomic updates are all the rage these software can’t be added – it can – but clarified the situation by saying this is
days. ChromeOS, iOS, Android, Fedora it’s added to a different partition (and possible, but not recommended. Any
Silverblue and EndlessOS (as well as optionally melded atop the root partition changes to that partition could be
most modern embedded devices) all via UnionFS or some other voodoo). overwritten on the next update. Still, if
feature an OS partition that’s mounted SteamOS 3, as you’ve probably you know Arch and don’t mind picking
read only. At update time, a new figured, uses atomic updates (complete up the pieces, read-only mode can be
filesystem is downloaded, the partition is with “A/B” shuffling, like ChromeOS) disabled by first setting a password (so
unmounted and the downloaded image with additional software installed via that sudo doesn’t complain), then
is written out in a single transaction. This Flatpaks (whose design is closely tied to running a script:
greatly reduces the probability of an OSTree images). Initially, there was some $ passwd
update breaking the OS, especially if confusion around whether the OS $ sudo steamos-readonly disable
there are two such partitions that are partition could be unlocked, so that new If it all goes wrong then the Deck
updated alternately, ensuring a fallback packages could be installed and recovery image is your friend. See
(ChromeOS does exactly this). Having a configuration files meddled with (it is https://help.steampowered.com/en/
read-only OS doesn’t mean additional based on Arch after all). Valve has faqs/view/1B71-EDF2-EB6D-2BB3.

All hands on Deck IN-DEPTH
all kinds of routers, smart TVs and other devices. The

Steam Deck in gaming mode doesn’t give away that
it’s running Linux, until you jump over into desktop
mode and there’s no mistaking the glorious full-fat
KDE Plasma desktop.
One of many benefits of running Arch (apart from
having cringey Redditors make cringey jokes about you)
is that the latest versions of Plasma, Qt and the KDE
Framework libraries all find their way into the official
repos very shortly after release. So the version of KDE
you find running on your Steam Deck might well be
newer than the one that’s running on your PC (if indeed
you run KDE).
The layout is pretty standard, using the dark theme
and classic applications menu. But desktop mode isn’t
just for show. Plug in a mouse, keyboard and monitor With all the graphics settings turned up to 11, SuperTuxKart rarely dropped below 60fps.
and the Deck is actually useful as a desktop PC. If (for
some unholy reason) you don’t like KDE then you can from these sources should all work fine, excepting
easily install something else. And if (and this one we perhaps some controller-related quirks. We borrowed
really can’t get our heads around) you don’t like Arch our Steam Deck from our digital friends at PC Gamer,
Linux you can install a whole new distro on a different who had taken it upon themselves to install Google
partition. Adding new software is easy thanks to the KDE Chrome as a Flatpak. It turns out that if you do this, and
Discover app store, which comes all hooked in to you have an Xbox Live account, then you can avail
FlatHub. Software installed this way can even be added yourself of Microsoft’s cloud gaming offerings. This will
to the main Steam interface via the Add a Non-Steam also work if you use Microsoft’s Edge (is nothing
Game option. sacred?–ED) browser, also available as a Flatpak.
An official dock for the Steam Deck (wonder what it The Epic Games Launcher also works fine with Proton,
will be called?) has already been announced, which will just switch to desktop mode, download and run. But
certainly boost the Deck’s utility as a regular PC. Until why not try the open source Heroic Games Launcher
then you can happily use a regular USB-C dock with the
RESTRICTION-FREE GAMING AHOY!

Deck, but some people have reported issues powering
the device from these. To be honest, given the number
“DRM-free games from the likes

of problems these docks cause at LXF Towers we’re
looking forward to using one that works as advertised.
of GOG and the Humble Store can

There are currently 1,000 odd verified titles and that
same number of “playable” titles available for the Deck
also be shoehorned on to the main

from Steam’s massive catalogue. Probably these
numbers will have increased by the time you read this
partition, or added via desktop mode.”

(anything that already works on Linux, natively or via
Proton, shouldn’t need much work). But the Steam Deck
doesn’t want you to stop at Steam games. The Add a
non-Steam option also enables you to install such instead, which supports
wonders as the (Windows-only) Epic Games Launcher. both Epic and GOG. Heroic
Lutris (the open source game manager) now has is available as a Flatpak, so
excellent Steam Deck support, but currently installing it you can add it to the Steam
requires us to break into that read-only sanctum that Deck from the Discover
houses Deck OS. A Flatpak version of Lutris is in the application. You can then
works, so this will soon change. add it to Steam as a non-
DRM-free games from the likes of GOG and the Steam game in the usual
Humble Store can also be shoehorned on to the main way. The Heroic Games Launcher
partition, or added via desktop mode. Again, Linux titles enables you to choose different versions
of Wine and Proton.
But why stop there? If you’re already a keen Linux
gamer then you’ll have already heard of Lutris, the open
source game manager. In addition to GOG and Epic, it
also supports Humble Bundle games, Steam itself
(which might not be so useful on the Deck but who
knows?), native Linux titles and many of the well-known
Linux emulators including Mame, Dolphin and RetroArch
ScummVM. Best of all a beta Flatpak of Lutris is
available, so there’s no need to inviolate the Deck’s
read-only sanctum. It’ll probably be out of beta by the
time you read this, so you won’t need to add the Flathub
Use the Add a Game option to add non-Steam things, like Lutris and Beta repo as outlined at https://github.com/flathub/
the all-important SuperTuxKart. net.lutris.Lutris.

The home of technology
techradar.com
THE BEST NEW OPEN SOURCE SOFTWARE ON THE PLANET
HotPicks
FireDM Mplayer Rnote Mailspring Airsane
Fbcat Topgrade Superdux Winterapples
Alexander Tolstoy
believes that we should
build better open source
applications instead of a
new iron curtain.
Casper-fs Zplora
DOWNLOAD MANAGER
FireDM
Version: 2022.2.5
Web: https://github.com
/firedm/firedm
ireDM aims to be the ultimate all-in-one suite
F for downloading items to your hard drive. This

application takes Libcurl, Ffmpeg and of course FireDM is a versatile download manager that can handle a wide range of files.
Youtube-dl, and wraps them up with a collection of
Python scripts and a custom-made GUI. The result is a EXPLORE THE FIREDM INTERFACE
responsive and compact application that can download
anything, be it an online video, an ISO image of a Linux
distro you want to try, or just some random files.
1
As you might know, Youtube-dl supports dozens of
popular video-hosting platforms, not just YouTube, 2
FireDM works with Youtube-dl’s advanced features and
enables you to download playlists, select video quality,
download just subtitles or just the audio track, perform 4
batch downloads and so on. Under the hood there are
two versions of that tool: the original one, plus Yt-dlp –
a feature-packed fork of Youtube-dl.
FireDM isn’t particularly media-centric. If all you 5
want to do is download a file, then FireDM is again at
your service. The application will try to speed up your
downloads by adding more workers and fetching a file
using many streams at once. You’ll see the progress bar
with segments of each worker under the Downloads 3
section. It’s a step above the basic downloading method
used by web browsers by default.
There are a range of settings for various non-
standard cases. You can define FireDM-specific proxy
Start at the Home screen Customise FireDM
settings, use custom website credentials, inject cookies, 1 Once you have the link, review the 4 The Settings section contains a lot of
set custom user agent and even disable SSL validation. download details under Home, set a target extras that may come in handy in special cases,
Just like the best download managers, FireDM monitors directory, manage batch tasks and more. such as when you need to authenticate your
your clipboard and grabs links automatically, maintains credentials within a website in order to retrieve
Control your downloads a file from it.
all download logs and even auto-updates itself. 2 The Downloads section contains the list
Everything should work out of the box, but you might of files that were added either for downloading Run the latest version of FireDM
be interested in tinkering with the FireDM settings, at manually, or within a playlist. 5 The application can update itself. It can
least for switching to another colour theme, or setting also checks for new versions of youtubedl and
Review download status yt_dlp, and grabs their latest versions.
the preferred way for minimising the program to its tray 3 FireDM usually fetches a file using
icon. We believe that anyone who regularly downloads several workers. It enables you to assess which
files is going to have a good time with FireDM! segments are finished and which are pending.

HOTPICKS
Mplayer is a
MEDIA PLAYER versatile player
that supports
almost any form
Mplayer of media.
Version: 1.5
Web: http://mplayerhq.hu
ecently there’s been an update to Mplayer, the
R video player for Linux and beyond. We settled

down to read the changelog for version 1.5, but
to be honest the changes aren’t particularly ground
breaking. There are some changes in the set of
decoders, the code has been cleaned up, there’s better Mplayer sports a wide range of supported media
localisation support (the GUI finally respects your codecs. Historically, it comes from the early 2000s –
locale!), and the new default skin enables you to run the the age of DVD ripping and video files down-sampling
Mplayer GUI even if there aren’t any skins installed. for use on tiny ancient phone screens. That said, you’ll
Mplayer 1.5 does a fairly good job of playing various be surprised how many options there are in Mplayer if
types of audio and video content. It includes a modern you just issue the $ ./configure –help command in its
version of Ffmpeg 5 and adds some more drivers and source tree. Build them all, or perhaps go with a tiny and
codecs on top of it. Mplayer also provides its own CLI memory-efficient Mplayer installation. In a nutshell, this
converter known as Mencoder. Obviously, transcoding gives you plenty of optimisation options for your video
any media file means writing a long command with library, if you have various tasks in mind. For instance,
several input and output arguments, which you may Mplayer is the perfect choice as a media player on
want to avoid by using some sort of a graphical Raspberry Pi and similar devices, whether you chose to
transcoder such as Handbrake (see LXF259). However, it run it in either a CLI or GUI mode.
doesn’t take long to get used to both Mplayer and By the way, exploring dozens of now naive-looking
Mencoder and in return you’ll have access to robust and skins feels like a real step back in time. Most of them
feature-rich playing and encoding capabilities. still work and, surprisingly, look good for their age!
Take notes
NOTE-TAKING TOOL with ease and
comfort, add more
objects, scale and
Rnote rearrange them

any way you like.
Version: 0.3.5
Web: https://github.com/flxzt/rnote
R
unning Linux on a device with touch controls
reveals a whole set of extra usability
requirements. One of those is a high-quality
application for taking either hand- or finger-written
notes. We’ve been looking for a capable open source will looks as though they were made on paper. The
version, and have come to the conclusion that Rnote is program isn’t solely about writing, though – you can
perhaps the best option that’s available. It’s a sleek add pictures, too. Use any of the available selection
graphical tool that provides you with an endless canvas tools to move an object, scale or rotate it. Objects can
and some drawing tools. overlap but Rnote doesn’t enable you to either bring
We didn’t expect its set of tools to be that advanced, them to the front or push then into the background.
though. As well as a pen and a brush there are multiple To be fair, such functionality isn’t usually called for
selector tools, shapes, a dedicated marker tool, and of when taking notes.
course an eraser. The brush tool has extra settings that You can save your sheets in Rnote’s own format,
you may be interested in adjusting. For instance, there’s which isn’t XML-based and can be read again only by
the cool ‘textured’ mode, which activates the gear Rnote itself. The latest version of the program is 0.3.5 at
button below it with extra options such as density, the time of writing, and we failed to build it from source in
radius of dots and their distribution. Such fine-grain Fedora because it required the latest GTK 4.6 library.
controls seems more appropriate for a vector graphics Not a problem for a rolling distro with a bleeding-edge
package like Inkscape, or a drawing tool like MyPaint. GTK4, but if you don’t care about this then head over to
If you have a tablet with a digital pen, then you’ll have Flathub and get Rnote up and running with no delay. It’s
an even better experience with Rnote and your notes a really nice tool that’s worth a try!

HOTPICKS
Mailspring is
MAIL CLIENT compatible with
popular mail
services, and
Mailspring you can set up

a custom IMAP
server for all your
email needs.
Version: 1.10 Web: https://github.com/
foundry376/mailspring
ailspring is an email client that’s been around
M for quite a while. It’s accumulated a decent

selection of new features since we last covered
it in LXF258, so this is a good opportunity to revisit this
outstanding software.
Mailspring is a direct alternative to Thunderbird and features are recent additions introduced in the past
Kmail, and also to the web-based interfaces that we’ve couple of years. The program is becoming more refined
all become used to. The reasons of choosing Mailspring and flexible. On the latter point, the application no
over its rivals include various nuances that relate to longer insists on signing up to the internal Mailspring
productivity and ease of use. This application makes account. If you don’t want or need it then it’s now
it possible to move several mail accounts into one possible to skip this step and proceed to add your
workspace, and it supports Gmail, Outlook, Office 365, target mail box.
Yahoo and, of course, custom IMAP servers. The program also advertises the Pro version, which is
The interface is clean and full of numerous usability available as a paid subscription. However, Mailspring’s
enhancements such as wizards, notifications and pop- free version is still very good and doesn’t leave you with
up tips. As for more advanced features, there are routes the feeling that you’re using a limited or a lacklustre
for mail forwarding, a functional tray icon (something mail tool. Every dialog or window conveys the efforts put
that Thunderbird still lacks), complex conditions in the into their usability by the dev team. If you’re unsure
search bar (for example, in:inbox NOT is:unread ), a about what standalone mail program to go with, give
built-in translator that’s available inside the new mail Mailspring a try. It offers RPM and DEB packages on the
composer and more. Most of the aforementioned Github Releases section.
FRONT-END FOR SANE
AirSane
Version: 0.3.2 Web: https://github.com/
simulpiscator/airsane
A
irSane is an interesting piece of software
designed for use with image scanners. The
purpose is to let any device supported
by SANE and plugged into a Linux machine to be
accessible from MacOS and Android. In other words, if
you have a flat-bed scanner or a multi-function device
with a scanning feature that can be used with Linux,
you’ll also be able to scan over a network from other
operating systems (although not Windows).
AirSane’s target audience are people with several Mopria Scan app on Android. In addition, AirSane runs a AirsaneMake your
imaging devices shared across the home LAN using the web server at port 8090 for easy network scanning SANE-shared
scanner work
‘net’ backend of SANE. Indeed, scanning should work right from a web browser.
better with other
flawlessly between Linux hosts, but not for a Macbook Not every Linux user will own a flatbed scanner. operating systems.
or an Android phone. AirSane is a beautiful way to fix it. However, it’s good to know that there’s Linux support.
This software runs a server daemon, which publishes all AirSane is a great improvement on an already good
devices detected by scanimage using the Linux-native level of scanning support in Linux. For example, the
Avahi daemon via mDNS. The technology includes parts proprietary scanning tool VueScan for Linux won’t work
of the reversed-engineered AirScan communication with SANE-shared scanners right away, but thanks to
protocol used in Apple devices. Once AirSane is running, AirSane it will. Moreover, it’s possible to tweak various
all detected devices are exported and available for all colour settings by editing the /etc/airsane/options.conf
ImageKit-compatible tools on MacOS, and also for the file. Consult the AirSane documentation for details.

HOTPICKS
Take screen shots

SCREENSHOT TOOL even if a black
console mode is all
you have to hand.
Fbcat
Version: 0.5.2
Web: https://github.com/jwilk/fbcat
he Linux text console may not look all that
T welcoming for running games or playing

multimedia files, but it’s still powerful and
capable of performing lots of productivity tasks. We’ve
discovered another handy tool you may find useful.
Fbcat is a great catch for anyone seeking a way to take
screen shots via the command line. It may first seem another is a high-level fbgrab tool. The former has
like another program in a long row of similar tools, but almost no external dependencies apart from the Make
things are a little bit more interesting this time. and Linux kernel userspace headers; it writes the /dev/
Fbcat is a low-level CLI tool capable of capturing a fb0 contents directly to a PPM file that you specify. The
screen using a Linux framebuffer device. That means latter supports PNG (via Image- or GraphicsMagick) and
you can take screen shots directly from the TTY console, virtual terminal switching. As such, you can use fbgrab
even when no display server is available. That’s a great for more advanced tasks because it enables you to
feature for remote servers’ administrators and anyone choose a virtual console (/dev/ttyX) and switch to a
dealing with a text Linux console. different ‘fbdev’ device. By the way, you can have as
The framebuffer output isn’t formally compulsory in many as 64 virtual consoles in Linux. Explicitly specify
Linux, although most if not all distributions use it by the one you want to grab using the following template:
default (check if /dev/fb0 is present on your system). sudo fbgrab -c 1 screenshot.png .
So we can assume there’s hardly any Linux system that By the way, adding yourself to the ‘video’ group
Fbcat won’t run for. The software consists of two will eliminate the need to raise privileges for taking
programs: one is a low-level fbcat grabber, and the screen shots!
Upgrade every part

PACKAGE MANAGER of your system
with just one single
command. It’s a
Topgrade terrific catch!
Version: 8.2.0 Web: https://github.

com/r-darwish/topgrade
O
ne of the well-recognised benefits of most
Linux systems is the streamlined and unified
update and delivery tools for managing
software packages, which also enable good
housekeeping with everything related to software
management. Let’s be honest, though: the situation and saved us from a lot of manual operations. As such,
isn’t that clear-cut these days because we have Snaps, it ran the updates for DNF, Flatpak, Rustup, Pip3, Docker,
Flatpaks, Appimages, plus a bunch of parallel package Firmware (fwupd) and Gnome extensions.
managers used by software developers, such as Pip, The list of items to update will vary depending on
NPM and Cargo. The problem is how to keep all that what’s installed on your system. Topgrade can handle
stuff up to date. The solution is Topgrade! most popular package managers, and it’s aware of
We were a bit sceptical about the usefulness of this tool dozens of modules, SDKs, managed repositories and
because unifying Linux distros, package managers, more. All of those work beyond Linux too, so that you
various frameworks and SDKs is a challenge in itself. can unify your upgrade procedures by switching to
However, Topgrade does a remarkably good job and Topgrade under Linux, MacOS and even Windows!
works very well. This tool detects every supported Topgrade is written in pure Rust, and therefore you’ll
package manager on your system and tries to run a need an appropriate toolchain to get it working. The
network update against it. It even doesn’t require any installation is simple. Run the following command:
arguments: the simple $ topgrade command does its $ cargo install --path .
job completely in auto mode. For instance, Topgrade did Then make sure you have $HOME/.cargo/bin in your
a lot of upgrade steps on our test Fedora Workstation PATH and you’re good to go.

Games HOTPICKS
Make sure you

VIDEO CONSOLE EMULATOR have some .gbc
ROM files and then
fire up Superdux.
Superdux
Version: GIT
Web: https://github.com/
snowymouse/superdux
uperdux is a new project for providing a
S graphical interface for Sameboy, which is in

turn an emulator for various retro gaming
consoles produced by Nintendo. Sameboy is part of
many Linux distributions, so if you’re longing for your
Nintendo games from around the late 90s, then this is By default, Superdux suggests you to use arrow keys
the software for you. and A, S, Z and X for recreating the buttons of the real
However, Sameboy’s barebones interface may put off Game Boy device. Of course, you can re-map them
some gamers, which is why we have Superdux. It’s a under Settings>Configure Controls. Each input device
Qt5-based front-end to Sameboy and provides quick has its own configuration page with lots of extra
access to its settings. Superdux enables you to quickly actions that you might be interested in, such as Turbo,
find out what GameBoy models are supported, increase Slowmo and Rewind. The video resolution is relevant
video scaling, set up key bindings, adjust the sound, to the actual Game Boy screens and thus it’s tiny
enable the FPS counter, apply colour correction and (and square!). It makes sense to increase the virtual
more. Even though Superdux is in its early stage of screen scaling ratio to either 4x or 6x.
development, it’s straightforward to start playing a We have had some happy Game Boy moments
game if you’ve obtained its ROM file. thanks to the broad set of Superdux features and the
Despite the fact that Superdux loads a tiny square high-quality emulation. Superdux is a well-developed
black window, it’s already configured with sensible front-end to Sameboy with lots of tools available for
defaults. Go to File>Open ROM and locate your game. both playing and debugging games.
ARCADE GAME
Winterapples
Version: GIT
Web: https://gitlab.com/darkforce/winterapples
any of us consider apples to be good for
M horses, even though too many apples won’t

help their diet. However, in Winterapples many
things are magical, and those delicious red apples don’t
cause harm to a horse. Instead, they give it even more
energy and stamina, enabling it to make high jumps.
Winterapples is a fun game made with the famous
Phaser engine. Phaser-based games usually run inside
a web browser and feature high performance and horse slowly starts to descend, there’s always a Help your horse
smooth graphics. Winterapples is no exception. The second chance to eat an apple and regain upwards reach new heights
and eat more of
game is a small effort, a one-man project – one of the momentum. Once you get ‘high enough’, don’t miss
those sweet apples!
thousands that we come across on Github and Gitlab a floating carrot – it doubles the score you get from
every day – yet it’s an entertaining game. The game apples. The more you play, the faster your score
features a nicely animated brown horse that can be increases, but remember: the higher you go, the
controlled with a mouse and made to walk sideways. further you’ll eventually fall.
Left-click to make it jump and then try to catch a Getting Winterapples up and running requires
hanging apple. That will score some points and also building the game using the supplied instructions
make the horse jump again. The goal is to collect apples (see Readme.md). After that you’ll need to publish
and keep ascending into the winter skies. Apples are the game’s files on a web server. It’s enough to copy
placed in such a way that you always have a possibility the assets to var/www/html and make sure your
to keep playing. Even if you miss one apple and the ‘httpd’ system service is running.

HOTPICKS
Casper-fs suggests
LINUX KERNEL MODULE a reliable low-level
way of hiding files
you don’t want
Casper-fs anybody to see.
Version: 0.2 Web: https://github.com/

CoolerVoid/casper-fs
ormally, you’d want to protect your sensitive
N information by setting read and write

permissions using the classic Unix file attribute
system that deals with users and groups. Alternatively,
you’d use a password-protection method.
Neither of these two methods have anything to do
with Casper-fs, which instead protects your file by
simply not showing it. This is done via building a custom change codewords for triggering the available
kernel module and injecting it into your running Linux protection features, as well as the name of the kernel
system. The idea is to define a list of files you want to module, and the fake device address.
conceal in a YAML configuration file, build a tiny casper- We ran a series of tests of Casper-fs and found it to
fs.ko module and insert it to the running Linux kernel be interesting. It’s not a replacement for fully fledged
via insmod. From that moment on your system – and security tools. Rather, it’s an auxiliary helper tool.
anyone else – won’t realise those files exist. Casper-fs prevents unwanted attention to your secret
To return visibility you can run rmmod casper-fs or files, and optionally prevents them from deletion.
reboot the system. However, Casper-fs has a built-in These are two separate features that you can
mechanism to turn files’ visibility on and off on the fly. combine randomly. When a file is concealed, it’s not
The program has a few more features, such as shown by ls or any other command. Removing it
protecting files without hiding them, and protecting the using the * mask or a wildcard won’t affect it, either.
kernel module itself. The settings are stored inside the However, if you know the exact name of the file, you
module_generator/rules/fs-rules.yaml file. You can can still edit, move or delete it.
Quickly filter your

FILE EXPLORER files and display
their size, both in
bytes and number
Xplora of code lines.
Version: GIT Web: https://github.com/

hicodersofficial/xplora
T
his isn’t the first time we’ve come across a file
management software intended to be used
inside a Linux terminal. There are lots of full-
featured file managers, like the classic twin-panel Far2l
(LXF280) and the VIM-style Ranger (LXF253). This time
we have a different tool that doesn’t run all the time, but $ xplora --extension .h --line-of-code
instead helps you on demand. This command will locate not just the *.h files in
Xplora enables you to sort and then display your current directory, but also in all subdirectories (add
files and directories structure. It sits between a super- -nr to run it in non-recursive mode). Xplora proved
charged ls and a tree-based file manager. The goal is to to be powerful and easy to fine-tune to specific tasks.
let you quickly assess the number of files and You can explicitly instruct it to ignore certain files
subdirectories and identify what’s using so much space. and even run a blacklist of such files (use -igp to
Normally Xplora displays the tree structure of the point to an .ignorepath file). Xplora’s output is neatly
current directory and then adds a table with some formatted and aligned. Subdirectories are displayed
relevant statistics, such as the number of elements and in green while files that match the filter are orange.
their total size. However, Xplora is capable of much To get Xplora, simply install the respective NodeJS
more once you become accustomed to its extra options. package from the public repository:
For instance, it can use filters based on file extension, $ npm install -g xplora
file size, date and time, and also calculate code lines. Be sure to explore the built-in help function and
The following example will reveal how many code lines discover even more features, including a custom start
are in header files: directory and more filtering options.

CODING ACADEMY
CODING ACADEMY
RUST Part Two
Develop Linux
Missed part
one? Turn to
page 62 to get
hold of it!
filesystem tools in Rust

Mihalis Tsoukalos explains how to manipulate and examine files and
directories in Rust so you can write filesystem tools.
he subject of this second Rust tutorial is
T working with files and directories as filesystem

entities. This means that we’re going to learn
how to move, delete and copy files, explore directories,
search directory trees and learn information about file
OUR permissions and file metadata. But first, we’re going to
EXPERT learn about the Result data type.
To get started we’re going to look deeper into the
Mihalis Result data type ( std::result::Result ) that we first saw
Tsoukalos in last month’s Rust tutorial. Result is a Rust enum.
is a systems An enum is a type with a list of different predefined
engineer and a values. An enum variable can only have one of these
This shows the documentation page of the std crate, which is part of
technical writer. predefined values at any given time. The definition of the Rust Standard Library and contains lots of handy functions, data
Find him on Result is as follows: types and macros.
Twitter using pub enum Result<T, E> {
@mactsouk. Ok(T), information about the environment the process
Err(E), runs on. So, with its functionality you can learn about
} environment variables, the current directory as well as
Given that, have in mind that we can change the other important directories.
signature of main() to return a Result value. So, The std::result module is about error handling with
because the Result enum has usually two values, the Result data type, which was presented in the
main() can be rewritten to something like the following: previous section.
fn main() -> Result<(), ParseIntError> { The screenshot (above) shows the official
... documentation page of the Rust Standard Library – you
} can find more about it by visiting https://doc.rust-lang.
You can replace ParseIntError with any error value org/std. Let’s take what we’ve covered and use it to
you want, including the generic std::io::Error , or you write a small command line utility that differentiates
can omit it entirely. You can learn more about Result by between regular files and directories.
visiting https://doc.rust-lang.org/std/result/enum.
Result.html. File or directory?
Our first step will be to differentiate between regular
Rusty Standards files and directories. The Rust source file is named
Rust comes with a rich Standard library that can be fTypes.rs. The logic of fTypes.rs can be found in the
extended with the use of external libraries, which in Rust following code excerpt:
terminology are called crates. This section presents the let md = metadata(&argument).unwrap();
Get the code most useful functions and modules from the Standard if md.is_dir() == true { ... }
for this tutorial library of Rust that are related to the subject of this if md.is_file() == true { ... }
from the tutorial – the standard Rust library is included under the The first statement reads the metadata of the
Linux Format std:: crate. So, the list of handy Rust modules includes provided path in order to examine it. So, if the is_dir()
archive: www. the following: method returns true, we’re dealing with a directory
linuxformat.
The std::path module contains functions and whereas if is_file() returns true, we’re dealing with a
com/archives
methods for cross platform path manipulation. regular file. It’s up to the developer to decide what code
?issue=289
The std::env module enables you to obtain to write and actions to take when dealing with a

Rust system tools CODING ACADEMY
directory or a regular file. Our utility just prints This shows the
Rust code of
information on screen. So, compiling and using
which.rs that
fTypes.rs produces the following output: presents an
$ ./fTypes fTypes.rs implementation
fTypes.rs is a regular file. of the which
$ ./fTypes /tmp utility in Rust.
Rewriting UNIX
fTypes.rs is a directory. command line
$ ./fTypes /doesNotExist utilities is a great
The /doesNotExist path doesn’t exist! way to learn a
$ ./fTypes /dev/nvme0n1p2 new systems
programming
The first two commands generate the expected
language.
output when processing a regular file and a directory,
respectively, whereas the third command shows what
kind of output to expect when the provided path cannot
be found. The last command shows that you obtain no
output when the provided path is neither a directory
nor a regular file. the std::process::exit() function. Strictly speaking,
In the section that follows, we’re going to write a std::process::exit() terminates the current process – at
simplified version of the which utility in Rust. If you don’t this point our program has a single process only – with
already know about which, type man which on your the specified exit code. We also need a (mutable)
Linux shell to visit its manual page. variable that holds the final return value, which is
called ret_value.
Let’s code which! The final value of ret_value depends on the found
Which returns 0 on success and 1 on failure. We should variable: if an argument isn’t found, then the value of
be able to implement that in Rust to be fully compliant ret_value changes from 0 to 1 and can’t become 0 ever
with a copy-cat which command. The logic of which.rs again. You can learn more about it by visiting https://
If you are not
can be found in the next code excerpt: doc.rust-lang.org/std/process/fn.exit.html. familiar with Go
for argument in env::args().skip(1) { or Python, it is
let split_path = my_path.split(":"); How to copy a file good to know
for v in split_path { Let’s create a tool to copy a file, just like the cp utility that the use of
... does, but without supporting all of the options of cp. walkdir::WalkDir
} This means that you copy a file without writing any File is pretty similar
} I/O system calls – this is handled by Rust. Using File I/O to the filepath.
The previous code processes all command line operations to process a file will be cover in the Rust Walk() function
found in the Go
arguments apart from the first one because of the tutorial of next month’s issue of Linux Format. The name
Standard library
use of skip , and tries to find a match in the different of the Rust source code file is copy.rs. The core
and os.walk()
paths of the PATH environment variable, which has functionality of copy.rs is presented in the following found in the
been read previously and stored in the my_path code excerpt: Python library.
variable. How you check each file path isn’t that match fs::copy(input, output) {
important (see the screenshot, top right, for more) –
what’s important is making sure that you process each
command line argument the correct way. Bear in mind THE RUST STANDARD LIBRARY
that if you give multiple command line arguments to
which and one of them isn’t found, the return value is In Rust terminology, std is a crate, and everything under it is called a
going to be 1 – our utility implements that as well. Using module. It’s helpful to have a look at the following modules:
which.rs (remember that you have to compile it first) std::string is for working with the String data type. https://doc.rust-
creates the following type of output: lang.org/std/string/struct.String.html.
$ ./which sed std::vec contains the Vector data type. You can learn about it at
/usr/bin/sed https://doc.rust-lang.org/std/vec/struct.Vec.html.
$ echo $? std::net contains networking functionality related to
0 TCP/IP. https://doc.rust-lang.org/std/net/index.html.
$ ./which sed123 std::fmt contains utilities for printing strings – see
sed123 not found https://doc.rust-lang.org/std/fmt/index.html.
$ $ echo $? std::thread module is about native threads. See
1 https://doc.rust-lang.org/std/thread/index.html.
We use the echo $? zsh and bash shell command to std::os provides OS specific functionality. For Linux-related info see
examine the exit status of the previous Linux command. https://doc.rust-lang.org/std/os/linux/index.html.
As desired, the first command returns 0 whereas the std::fs contains filesystem manipulation operations. Its help
second command returns 1. This is really important page is at https://doc.rust-lang.org/std/fs/index.html.
when you want to include your Rust command line std::io, which is going to be used in the next tutorial, is all about
utilities into shell scripts, CI/CD jobs or other tasks File I/O. See https://doc.rust-lang.org/std/io.
that check the exit code of a command to determine You can learn even more about the Rust Standard Library at
its success or failure. https://doc.rust-lang.org/std/. Finally, visit https://doc.rust-lang.
The screenshot (top right) shows part of the code org/core/index.html to find out more about the core crate.
of which.rs. In order to return the desired value, we use

CODING ACADEMY Rust system tools
Ok(n) => println!("Wrote {} bytes”, n), $ ./permissions permissions.rs

Err(err) => println!("Error: {}”, err), 100644
You can learn }; $ ./permissions permissions
more about Everything here is done by the fs::copy(input, output) 100755
Rust at www. call, which copies the file, provided that the input path $ ./permissions /tmp/DoesNotExist
rust-lang. already exists. After executing fs::copy(input, output), The /tmp/DoesNotExist path doesn’t exist!
org/learn and we examine the return value of it, which can be either The first three digits are not of interest at this point –
you can ask
Ok(n) or Err(err) . In the first case, the call returns the the last three digits contain the information we’re
questions at
number of bytes written, which is stored in variable n, looking for. So, the file permissions of permissions.rs are
https://users.
rust-lang. and in the second case, we print the error message 644 (rw-r--r--) and the file permissions of the
org. The Rust returned by the call. executable file are 755 (rwxr-xr-x). If the file doesn’t
playground, The screenshot (bottom of page 92) shows the main exist, we receive a descriptive error message. You can
which can be code of copy.rs. Although copy.rs catches the case learn more about file permissions by visiting the man
found at https:// where the input file doesn’t exist, fs::copy() might catch page of chmod ( man chmod ).
play.rust-lang. other types of error conditions such as insufficient Unix
org, enables you permissions to read the input file and not enough File details
to experiment permissions to write the output file. Apart from that, Let’s take a quick look into interrogating Linux files
with Rust
bear in mind that most of the code is about catching using various Rust functions and methods provided by
from your web
error conditions and reading user input – fs::copy() is Rust. All this new functionality is included in details.rs.
browser without
having to install just a single statement. Running details.rs generates the following output:
Rust first. $ ./details details.rs
Renaming files Is file: true
This brief section presents a small utility that can Is dir: false
rename files. The source code file is called rename.rs, Is Symlink: false
which shares most of its code with copy.rs because Len: 908
they both require two command line arguments. The Last accessed: Ok(SystemTime { tv_sec: 1635349397, tv_
logic of rename.rs is found in the fs::rename(input, nsec: 554953691 })
output).expect("Unable to rename") statement. The Last modified: Ok(SystemTime { tv_sec: 1635349396,
fs::rename() function does all the job of renaming tv_nsec: 714952586 })
and is also able to catch errors related to filesystem Created: Ok(SystemTime { tv_sec: 1635349396, tv_nsec:
permissions. Bear in mind that fs::rename() requires 714952586 })
that both file paths are in the same filesystem. Please The screenshot (facing page) shows the Rust code
look at rename.rs for more details. of details.rs.
Deleting files Creating a directory

Deleting a file is an essential task for an operating This section will teach you how to create a new
system. However, we should be very careful when directory. The presented utility can create a directory
deleting files. The code functionality of delete.rs is structure – that is, all directories in a path, if some of
implemented using the fs::remove_file() method. them are missing. This also works for creating a single
Working with delete.rs generates the following type directory, if all parent directories already exist. The
of output: recursive(true) part is what makes DirBuilder::new()
$ ./delete /tmp/copy.rs to recursively create any missing directories. Using
$ ./delete /tmp/copy.rs createDir.rs produces the following output:
thread ‘main’ panicked at ‘called `Result::unwrap()` on $ ./createDir /tmp/1/2/3/4/5/6/7
an `Err` value: Os { code: 2, kind: NotFound, message: $ ./createDir /tmp/1/2/3/4/5/6/7
“No such file or directory” }’, delete.rs:15:31 The /tmp/1/2/3/4/5/6/7 path already exists!
If you can run this with the RUST_BACKTRACE=1 The output of tree /tmp/1 is going to verify that
environment variable to display a backtrace. /tmp/1/2/3/4/5/6/7 was successfully created. Bear in
The first command was executed successfully. As mind that DirBuilder::new() isn’t the only Rust function
expected, trying to delete the same file twice fails. In
that case, Rust itself generates an error message that
explains the error situation.
File permissions
In this section you’re going to learn how to get the
permissions of a file. The logic of permissions.rs can be
found in the next code excerpt:
let metadata = fs::metadata(input)?;
let perm = metadata.permissions();
println!("{:o}”, perm.mode());
First, we read the metadata of a file and then we
obtain its file permissions by calling metadata.
permissions() . Last, we print the file permissions as an
Octal value using {:0} in println!() . Using permissions.rs Here’s the code of copy.rs, which shows how to copy a file in Rust. The
produces the following output: core functionality is implemented by the fs::copy() function.

Rust system tools CODING ACADEMY
that can create directories. There are two other

functions named create_dir() and create_dir_all() in TYPES OF UNIX FILES
std::fs that can be used for this purpose.
Finally, there are two functions for deleting In Linux and Unix, everything is a file, even your printer! As a result,
directories: remove_dir() , which is used for deleting there are many types of Unix and Linux files, including the following.
single directories; and remove_dir_all() , which is used Plain text files: these are used for storing text used for system
for deleting directory structures, just like create_dir_ configuration files, YAML files, source code, etc. Easily processed line
all() is used for creating directory structures. Both by line, character by character or even word by word.
functions can be found in std::fs . Binary files: from an OS perspective, these are just like plain text
files. The reason for a separate entry is that usually there’s no point in
A simple find processing binary files the same way as plain text files.
Let’s pull all this knowledge together and code a Directories: these filesystem entries contain lists of files and
simplified version of find that visits multiple directories references to other files instead of any kind of user stored data.
and searches for Rust source files, which are files with Links: there exist two kinds of links, which are symbolic links and
the .rs file extension. We’re going to use a Cargo project hard links. Please visit the man page of ln for more information.
because we need an external crate. The first task is to Unix domain sockets: this kind of file is used for IPC (Inter Process
create the Cargo project: Communication). Put simply, they enable processes on the same
$ cargo new find --bin machine to communicate with each other, which saves you from
$ cd find having to create a TCP/IP network connection.
Bear in mind that by default, Cargo assumes that you Character device files: this kind of file includes devices such as
want a GitHub repository for your project. If you don’t terminals, keyboards, printers and mice.
want to use that capability, you can delete the .git Block devices: devices like hard disks, DVDs, tape drives and so on.
directory and the .gitignore file from the root directory Named pipes: used for IPC and is an extension of the regular pipe.
of your Cargo project. We need to edit Cargo.toml to add
a dependency – the final version of Cargo.toml is going
to be as follows: line argument and making sure that the user input is an
[package] actual directory. You can build the project with cargo
name = “find” build . Using the find utility – its executable is ./target/ If you want to
version = “0.1.0” debug/find – generates the following output: experiment,
you can try
edition = “2018” $ ./target/debug/find .
writing a utility
[dependencies] ./src/main.rs
that copies
walkdir = “2” $ ./target/debug/find .. entire directory
So, the name of the utility is find and its only ../rename.rs structures
dependency is the “walkdir” crate – this crate contains ../find/src/main.rs including
walkdir::WalkDir() , which is very powerful and accepts ... their files.
many options. By default, walkdir::WalkDir() ../permissions.rs Additionally,
processes everything under a given directory root You can discover more about directory traversal at you can add a
specified with new(<root path>) . If you want to filter the https://rust-lang-nursery.github.io/rust-cookbook/ flag in order to
output, you should use filter_entry() or filter() or both. If file/dir.html. In this tutorial, we learned a lot of handy only duplicate
a directory
you examine the contents of ./src/main.rs, the filter_ information about working with the Linux filesystem in
structure
map() part shows what to do with any errors that might Rust. The next Rust tutorial is going to be all about File
without the
come up – in our case, we silently ignore all file entries I/O (File I/O operations are an essential part of all included files.
with errors. operating systems), which includes reading files, writing
Remember that if you don’t want to take any actions files, appending to files and more.
on the entries other than printing, you can just use You can learn more about Rust at www.rust-lang.
walkdir::WalkDir as follows, which is the simplest form org/learn and you can ask questions at https://users.
of walkdir::WalkDir usage: rust-lang.org. Finally, the Rust playground, which can be
for entry in WalkDir::new(<root path>) { found at https://play.rust-lang.org, enables you to
println!("{}”, entry?.path().display()); experiment with Rust from your web browser without
} the need to install Rust on your machine.
However, in our case we use WalkDir::new() in a
more advanced way. For each entry returned by
WalkDir::new(argument) that isn’t a directory, we
examine whether the file name ends with the .rs file
extension or not. The .filter(|e| !e.file_type().is_dir())
part makes sure that we’re not examining directory This screenshot
entries and the if f_name.ends_with(”.rs") statement shows the source
checks the file extension. If it has the .rs file extension, code of details.
then we print the relative path of that file. rs. The details.rs
utility illustrates
Apart from the use of walkdir::WalkDir , the utility how to get detailed
makes the necessary actions that you would expect information about
from a system utility: reading user input as a command file system entries.
GET MORE RUSTY WRITTEN THINGS Subscribe now at http://bit.ly/LinuxFormat

CODING ACADEMY Updating code
PYTHON
Credit: https://github.com/bashkirtsevich-llc/PyBlackJack
Update and improve

old blackjack code
Updating old projects can be fun and educational. Andrew Smith
ensures that your cards are dealt correctly at any resolution.
e’re going to take a look at an old Blackjack
W project and see how we can update and modify

it. Blackjack is a card game where the aim is to
get a value total of 21 (or closest to 21) across the cards
you’re given, to win a round of the game.
OUR The original project contains some interactive
EXPERT features that we can experiment with, such as buttons
and events, along with some pleasing visual resources
Andrew Smith that we’ll look at in this tutorial. The original project that
is a software this tutorial is based on was created by Allan Lavell,
developer at NHS and the original source code can be retrieved from
Digital, and has https://github.com/bashkirtsevich-llc/PyBlackJack.
qualifications During this tutorial we’ll cover how the game A new game of Blackjack. The dealer’s hand is shown at the top half of
in software program works and what resources are included for the the screen, while the player’s hand is at the bottom half of the screen.
engineering project to work. We’ll then look at positioning elements
and computer on the screen in relation to the screen resolution that To edit and view the source code you can either use
networks. the program is running in. We’ll also add a button to the your distro’s default text editor or more specific
program, which will be used to exit the game. programs such as Notepad++, PyCharm or VS Code.
We’ll be using gedit to view and edit the source files. If
Shuffling your cards and when using this method to view/edit source files, it
For this tutorial we’ll install and set up the latest version may be helpful to open two console windows. One for
of Python (3.10). For those that have Python/PyGame editing and viewing source files, and the other terminal
already installed, Python 3.8+ should be fine. Type the window for executing the PyGame code.
following code to install Python 3.10 and PyGame.
sudo apt-get install python3.10 Project overview
sudo apt-get install python3-pip This project requires a lot of graphical resources for the
python3.10 -m pip install pygame program to work. For example, you’ll find the full 52
Check both the Python and PyGame versions. Next, deck of cards in the /images/cards folder. Navigate to
git clone from repository. this location on your machine to have a look at the card
git clone https://github.com/asmith1979/lxf289_ images that have been stored. You’ll see that there’s an
blackjack/ image for each card in the deck as a well as a back-
The project has been put into a folder called facing card image which is used in our Blackjack
When choosing
PythonProjects, which was created before downloading program. Card images have been created for each suite:
names for
the project. Alternatively the source code and project Hearts, Diamonds, Clubs and Spades.
classes,
functions or can be retrieved from the LXF289 archives at https:// In the folder that’s above this one – images – you’ll
variables, linuxformat.com/archives. see all the other image resources that are used in the
make them This tutorial will focus on the source code located in game program. This includes the background image for
meaningful so the lxf289_blackjack folder. Type cd lxf289_blackjack the game and images of various buttons that the player
that someone to open the folder and gain access to the Python source can interact with during gameplay.
else reading the code. You’ll see two Python source code files: blackjack. This Python project also uses sound to enhance the
code can see py and lxf289ans.py. The Python file blackjack.py is the player experience. The sound effect file that we’ll be
what they’re Python script file that you’ll be editing and lxf289ans.py using is located in the sounds folder. Inside this is the
intended for
contains the full tutorial code. file click2.wav.

Updating code CODING ACADEMY
The code for the project consists of independent

functions and object orientated programming
techniques (classes). It’s not the aim of this tutorial to
cover all the code in-depth, but we will provide an
overview of the main important parts that make the
game program work and will bear some relevance with
what’s required later in this tutorial.
Because there are a lot of images used for this
project, you may or may not have caught on to the fact
that a lot of image loading takes place initially so that all SCREEN_WIDTH = 600 The screenshot
image resources are ready for the game program to use. shows the setup
and configuration
The function to used to load all images for the project is # SCREEN_WIDTH = 1280
of Python and
called imageLoad , which can be seen near the top of # SCREEN_HEIGHT = 718 PyGame after
blackjack.py. Its code looks like the following: We now have constant values for the background being correctly
def imageLoad(name, card): image, card images and button images, which saves us installed.
having to use numeric values such as 0, 1 and 2. We can
if card == 1: refer to them by name instead.
fullname = os.path.join("images/cards/”, name) The next step is to rename the second argument
else: passed into imageLoad from card to imageTypeIn
fullname = os.path.join('images’, name) because now we’re trying to differentiate between
three types of image – the background image, card
image = pygame.image.load(fullname) image and button image – the details of which can be
image = image.convert() passed into the imageLoad function. Values for the
screen dimensions have also been added here, where
return image, image.get_rect() one set of screen dimensions have been added but
Overall, this function takes in two arguments: one is commented out. This enables us to experiment with
the file name and the other is an argument to identify different screen resolutions for the program to run in.
whether or not a card image needs to be loaded. After Not too far down (or up) from this, is a line that reads
loading the image into memory, the function returns screen = pygame.display.set_mode((1280, 718)) . Replace
both the image as an object as well as a rectangle 1280 with SCREEN_WIDTH and 718 with SCREEN_
surrounding the image. However, the function doesn’t HEIGHT (or commonly known as substituting).
account for different screen resolutions that the The next step is to add the following code into the
program might be run in. This would result in, for imageLoad function itself after the line image =
example, the background image looking out of pygame.image.load(fullname) :
proportion with the rest of the program’s visual if imageTypeIn == BACKGROUND_IMAGE:
elements. To correct this, we can make some changes image = pygame.transform.scale(image, (SCREEN_
to our program as well as to the imageLoad function as WIDTH, SCREEN_HEIGHT))
described below. This code will expand any image loaded in as a
First, near the top of the program, after where the BACKGROUND_IMAGE to the screen dimensions that It’s useful to
Python libraries are included, type the following code: the program has been told to run at. To test this, write look at existing
BACKGROUND_IMAGE = 0 the following code just after where you specified examples of
CARD_IMAGE = 1 BACKGROUND_IMAGE, CARD_IMAGE , etc. The classes and
BUTTON_IMAGE = 2 function now should look something like the following: functions as a
guide as to how
def imageLoad(name, imageTypeIn):
write your own.
SCREEN_WIDTH = 800 global SCREEN_WIDTH
OBJECT ORIENTATED PROGRAMMING (OOP)

There have been quite a few object pygame.sprite.Sprite.__init__(self) ....
orientated programming techniques self.image, self.rect = A class is first declared using the class
used in the project. For example, classes imageLoad("deal.png”, 0) keyword as demonstrated above, class
have been used to create all the buttons self.position = (1155, 425) dealButton in this case. The next step is
we interact with in the game program: to write out the class constructor
Hit Button, Deal Button, Stand Button... def update(self, mX, mY, deck, identified by def __init__(self) , which is
etc. Each button class contains various deadDeck, roundEnd, cardSprite, cards, used to initialise properties (or variables)
properties and functions for the playerHand, dealerHand, dCardPos, to certain values when an instance of the
necessary operations to take place. pCardPos, displayFont, playerCards, class is created. In the above example,
Below we look at the dealButton class as click, handsPlayed): the class constructor is used to load in an
an example. Only the main parts of the # Get rid of the in between-hands image of the deal button and also set the
class are shown to demonstrate the main chatter position of the button. Also in this class is
concepts and ideas. textFont = pygame.font.Font(None, an update method (or function) that’s
class dealButton(pygame.sprite.Sprite): 28) been implemented to update positions
def __init__(self): during gameplay.

CODING ACADEMY Updating code
global SCREEN_HEIGHT pygame.sprite.Sprite.__init__(self)

self.image, self.rect = imageLoad("up.png”,
if imageTypeIn == CARD_IMAGE: BUTTON_IMAGE)
fullname = os.path.join("images/cards/”, name)
else: ....
fullname = os.path.join('images’, name)
def update(self, mX, mY, bet, funds, click, roundEnd):
image = pygame.image.load(fullname) if roundEnd == 1: self.image, self.rect =
imageLoad("up.png”, BUTTON_IMAGE)
if imageTypeIn == BACKGROUND_IMAGE: else: self.image, self.rect = imageLoad("up-grey.
image = pygame.transform.scale(image, (SCREEN_ png”, BUTTON_IMAGE)
WIDTH, SCREEN_HEIGHT)) You should see something like the following when
you view the code in your chosen IDE. Where BUTTON_
image = image.convert() IMAGE is, there should be a number 0, so replace this
with BUTTON_IMAGE as in the example just shown.
return image, image.get_rect() Do the same for the other classes described above
Because SCREEN_WIDTH and SCREEN_HEIGHT ( hitButton , standButton , dealButton , etc). After
are global variables, we include them into this function you’ve done this, save and run the program and you
by using the global keyword. To test that our code should see that buttons are now to scale (but could be
works, run the program with the existing screen settings positioned off-screen depending on screen resolution
and then run the program again, commenting out the you are using). Even though the scaling issue with the
existing SCREEN_WIDTH and SCREEN_HEIGHT and button images is now fixed, the position of the buttons
removing comments from the other SCREEN_WIDTH is not, because they’ll only appear correct if using the
and SCREEN_HEIGHT before the program is run. screen resolution 1,280x718. We’ll do something about
What you’re looking for in the program output is that this next.
the background image loaded in looks the same as in We’re now going to implement a class of our own
each screen settings. The buttons may appear funny called buttonPositioningValues . The purpose of this
and out of position when running at a different screen class or (data structure) is to position all the buttons
resolution, but we’ll fix this later. To exit the program relative to the screen resolution that’s been set. This
you’ll have to press Ctrl+C because there’s no way to means regardless of what screen resolution is used, the
formally exit the game. Later in this tutorial we’ll be buttons will always appear in a constant position.
adding a button that will enable you to quit the game. Near the top of blackjack.py after the constant
Next we’ll add code that will position the buttons variables have been defined ( SCREEN_WIDTH , etc.),
correctly relative to the screen resolution that’s being write out the following code:
used. However, before we add this code we could do # UI Button Positioning variables
with amending some of the existing code to prepare class buttonPositioningValues:
for this. Each of the buttons that have been created
each have a class of their own (an object orientated # Class Constructor
programming concept), which you’ll see declared in the def __init__(self):
program as hitButton , standButton , dealButton , self.myvalue = 1
Here, the dealer doubleButton , betUpButton and betDownButton .
has won a round at Each of these classes contain three calls to the image # Get the screen dimensions
Blackjack and that load function. As an example, let’s briefly look at the screenWidth = SCREEN_WIDTH
the player has lost class betDownButton . screenHeight = SCREEN_HEIGHT
and has also lost
class betButtonUp(pygame.sprite.Sprite):
$10. Once a round
is over, the player # Set Deal Button Position
can only deal. def __init__(self, positionXIn, positionYIn): dealButtonPosition_X = (screenWidth-125)
dealButtonPosition_Y = (screenHeight-193)
# Set Hit Button Position

hitButtonPosition_X = (screenWidth-125)
hitButtonPosition_Y = (screenHeight-243)
# Set Stand Button Position

standButtonPosition_X = (screenWidth-125)
standButtonPosition_Y = (screenHeight-280)
# Set Double Button Position

doubleButtonPosition_X = (screenWidth-125)
doubleButtonPosition_Y = (screenHeight-317)
# Set Up Arrow Position

upArrowButtonPosition_X = (screenWidth-150)
upArrowButtonPosition_Y = (screenHeight-370)

Updating code CODING ACADEMY
GAMEPLAY FUNCTIONS
Even though object orientated programming has been implemented
in this project, these individual functions have been used to help with
the gameplay of Blackjack:
imageLoad for loading an image resource.
soundLoad used to load a sound resource.
display this displays text on the screen.
playClick for playing a sound resource once loaded.
gameOver used to display the game-over screen.
shuffle use this to shuffle the deck of cards using the Fisher-Yates
algorithm, which helps eliminate the element of predictability.
We’ve added a Quit button to the game so the player can leave at any createDeck this creates the logical structure of deck of cards.
time. This saves the player having to press Ctrl+C to exit the program. returnFromDead when the main deck of cards has been emptied.
deckDeal used to shuffle the deck.
# Set Down Arrow Position hit for taking cards from the deck.
downArrowButtonPosition_X = (screenWidth-100) checkValue this checks the value of the hand of player and dealer.
downArrowButtonPosition_Y = (screenHeight-370) blackJack for seeing if blackjack has been achieved either by the
player or dealer.
# Quit Button Position bust used when player is bust.
quitButtonPosition_X = 100 endRound determines what happens with the cards at the end of
quitButtonPosition_Y = (screenHeight-100) a round.
You’ll notice from the code we’ve just written that the compareHands this is used at the end and beginning of a round to
X and Y position values are relative to the screen width compare hands of player and dealer.
and screen height, and are offset by a certain value to
position them on the screen. Now that our class has
been written out we now need to declare what’s known self.xPos = positionXIn
as an instance of a class, so that the properties of the self.yPos = positionYIn
class can be accessed. Before we do this, scroll down
to just under where there’s a comment that says def update(....)
INITIALIZATION BEGINS and type the following code: # 3. Pass the position values into the position
uiButtonPosition = buttonPositioningValues() self.position = (self.xPos, self.yPos)
The next step from this is to alter the existing class The first step in altering the class is to change the
constructors of the buttons used in the game program. constructor of the class as above to take in positionXIn
The below is example of what you’ll need to do to each and positionYIn . The rest of the changes are identified
button class. by comments in the above code example. Before
bbU = betButtonUp(uiButtonPosition. continuing with the tutorial, do the same to the other
upArrowButtonPosition_X, uiButtonPosition. button classes for the game program.
upArrowButtonPosition_Y) When you’ve done all the changes to each class, save
bbD = betButtonDown(uiButtonPosition. your changes and execute the program. You’ll see that
downArrowButtonPosition_X, uiButtonPosition. all the buttons have been positioned relative to the
downArrowButtonPosition_Y) screen resolution. Because there’s quite a bit of code to
As can be seen from this code, the class alter, check the python file lxf289ans.py. The answer
constructors of betButtonUp and betButtonDown source code is written in there to see if your code is
have been altered to accept X and Y positions for the consistent with the answer… no cheating though! The
relevant buttons declared in our button-positioning text that’s displayed in the game program is positioned
class. Before continuing with the tutorial, do the same relative to the button buttons (see lxf289ans.py).
for each of the other button classes. The button classes Finally, we need to add a button to quit the game
themselves also need to be altered for each button program rather than just pressing Ctrl+C. The image
featured in the game program. Below is an example of resource for a quit button has already been created in
how it’s done for the dealButton class: the image folder location. In the answer Python file,
class dealButton lxf289ans.py, there’s a class created called quitButton
... that’s used for the display and operation of the quit
button in the game. Going over what we’ve covered in
def __init__(self, positionXIn, positionYIn): this tutorial, see if you can work out how it’s been
pygame.sprite.Sprite.__init__(self) written, before looking at lxf289ans.py. To help you,
self.image, self.rect = imageLoad("deal.png”, have a look at the existing button classes that have
BUTTON_IMAGE) been written to see if it’ll provide you with any clues.
self.position = (positionXIn, positionYIn) Instead of scrolling through code in an IDE, use the
search facilities available to go direction to the function
# 2. Set the position values as part of class or variable directly.
WE'RE OLD AND NEED UPDATING Subscribe now at http://bit.ly/LinuxFormat

NEXT MONTH
The #1 open source mag
Future Publishing Limited,

Quay House, The Ambury, Bath, BA1 1UA
LXF290
Email linuxformat@futurenet.com
EDITORIAL
Editor Neil Mohr
will be on sale Canonical Shill Jonni Bidwell

Art editors Catherine Kirkpatrick, Andy Cottle,
Efrain Hernandez-Mendoza
Tuesday Operations editor Cliff Hope
Group editor-in-chief Graham Barlow
31 May Group art director Jo Gulliver
Editorial contributors
2022 Neil Bothwick, Stuart Burns, Matthew Hanson,
Matthew Holder, Jon Masters, Mike McCallister,
Nick Peers, Les Pounder, Michael Reed, David Rutland,
Mayank Sharma, Shashank Sharma, Andrew Smith,
Mihalis Tsoukalos, Alexander Tolstoy
Cover illustration magictorch.com
Ubuntu is a trademark of Canonical Limited. We are not endorsed
by or affiliated with Canonical Limited or the Ubuntu project.
Raspberry Pi is a trademark of the Raspberry Pi Foundation.
Tux credit: Larry Ewing (lewing@isc.tamu.edu) and The GIMP.
ADVERTISING
Commercial sales director Clare Dove
clare.dove@futurenet.com
Senior advertising manager Lara Jaggon
lara.jaggon@futurenet.com
Head of commercial – Technology Dave Randall
dave.randall@futurenet.com
Account director Andrew Tilbury
andrew.tilbury@futurenet.com
INTERNATIONAL LICENSING
Head of Print Licensing Rachel Shaw
2022
Linux Format is available for licensing and syndication.
To find our more contact us at licensing@futurenet.com
or view our content at www.futurecontenthub.com.
HACKER’S
NEW SUBSCRIPTIONS & BACK ISSUES
Web www.magazinesdirect.com
UK 0330 333 1113 World +44 (0) 330 333 1113
EXISTING SUBSCRIPTIONS
Web www.mymagazine.co.uk
UK 0330 333 4333 World +44 (0) 330 333 4333
Subscription delays: Disruption remains within UK
MANUAL
and International delivery networks. Please allow up to
7 days before contacting us about a late delivery to
help@magazinesdirect.com
CIRCULATION
Head of newstrade Tim Mathers
PRODUCTION AND DISTRIBUTION
Head of production UK & US Mark Constance
Production project manager Clare Scott
Senior ad production manager Jo Crosby
Digital editions controller Jason Hudson
THE MANAGEMENT
MD, tech specialist Keith Walker
Black hoody in hand, we reveal the

Head of art and design Rodney Dive
Design director Brett Lewis
Commercial finance director Dan Jotcham
Printed by Wyndeham Peterborough, Storey’s Bar
tools of the trade for pentesting,

Road, Peterborough, Cambridgeshire, PE1 5YS
Distributed by Marketforce, 5 Churchill Place, Canary
Wharf, London, E14 5HU www.marketforce.co.uk
breaking websites and more!

Tel: 0203 787 9001
Linux® is the registered trademark of Linus Torvalds in the U.S. and other countries.
GNU/Linux is abbreviated to Linux throughout for brevity. Where applicable code
printed in this magazine is licensed under the GNU GPL v2 or later. See www.gnu.
org/copyleft/gpl.html. All copyrights and trademarks are recognised and respected.
Disclaimer All contents © 2022 Future Publishing Limited or published under
licence. All rights reserved. No part of this magazine may be used, stored,
transmitted or reproduced in any way without the prior written permission of the
publisher. Future Publishing Limited (company number 2008885) is registered in
Discover Portainer England and Wales. Registered office: Quay House, The Ambury, Bath BA1 1UA. All
information contained in this publication is for information only and is, as far as we
are aware, correct at the time of going to press. Future cannot accept any
responsibility for errors or inaccuracies in such information. You are advised to
contact manufacturers and retailers directly with regard to the price of products/
services referred to in this publication. Apps and websites mentioned in this
Forget the mess that is Docker – we sip from the Portainer cup publication are not under our control. We are not responsible for their contents or any
other changes or updates to them. This magazine is fully independent and not
affiliated in any way with the companies mentioned herein.
and take Red Hat’s container system for a spin. If you submit material to us, you warrant that you own the material and/or have
the necessary rights/permissions to supply the material and you automatically grant
Future and its licensees a licence to publish your submission in whole or in part in
any/all issues and/or editions of publications, in any format published worldwide and
on associated websites, social media channels and associated products. Any
material you submit is sent at your own risk and, although every care is taken, neither
CAD for beginners

Future nor its employees, agents, subcontractors or licensees shall be liable for loss
or damage. We assume all unsolicited material is for publication unless otherwise
stated, and reserve the right to edit, amend, adapt all submissions. All contents in
this magazine are used at your own risk. We accept no liability for any loss of data or
damage to your systems, peripherals or software through the use of any guide.
Notes: Effy’s back!
Before Blender and 3D printers, people used CAD to design We are committed to only using magazine paper derived from
responsibly managed, certified forestry and chlorine-free
3D spaces and objects. We get to grips with FreeCAD. manufacture. The paper in this magazine was sourced and
produced from sustainable managed forests, conforming to
strict environmental and socioeconomic standards. The
manufacturing paper mill and printer hold full FSC and PEFC
certification and accreditation.
Run a website Future is an award-winning international media group and

leading digital business. We reach more than 57 million
Content Management Systems rule the web and, outside of international consumers a month and create world-class
content and advertising solutions for passionate
consumers online, on tablet & smartphone and in print.
WordPress, what’s the right open source solution for you?
Linux, the final frontier

For a long time space was the one place Linux was barred
from, but now it’s even on Mars! What happened there? Future plc is a public
company quoted on the
London Stock Exchange
Chief executive Zillah Byng-Thorne
Non-executive chairman Richard Huntingford
!ǝǣƺǔˡȇƏȇƬǣƏǼȒǔˡƬƺȸ Penny Ladkin-Brand
(symbol: FUTR)
www.futureplc.com Tel +44 (0)1225 442244
Contents of future issues subject to change – we might not be able to afford to put the lights on!
98 LXF289 June 2022

9000 9001

LXF - 289 - June 2022

Uploaded by

Copyright:

Available Formats

LXF - 289 - June 2022

Uploaded by

Document Information

Copyright

Available Formats

Share this document

Share or Embed Document

Sharing Options

Did you find this document useful?

Is this content inappropriate?

Copyright:

Available Formats

LXF - 289 - June 2022

Uploaded by

Copyright:

Available Formats

THE BEST LINUX APP STORES

Delivering hot open source software direct to your desktop!

Run full-fat Linux on

Enter the Linux multiverse with

FULL HOUSE! RUST TOOLS TERMINAL TIPS

Start coding your Enhance your skills Manage your ebooks

MEET THE TEAM Jammy upgrades

Michael Reed Neil Mohr Editor

www.techradar.com/pro/linux June 2022 LXF289 3

Cast aside your old OS

Linux Mint Debian Edition 5 22

Ubuntu 22.04 LTS 24

The Last Cube 27

Open source app stores 28 Get packing! 48

4 LXF289 June 2022 www.linuxformat.com

Raspberry Pi news 43 TERMINAL: Reading ebooks 52

Python-based reaction game 46

CODING ACADEMY ASSISTANT: Home automation 64

Kernel watch 10 Overseas subscriptions 63

www.techradar.com/pro/linux June 2022 LXF289 5

FOSS community stands

OPEN SOURCE SANCTIONS

“Red Hat has announced that

it’s ceased sales and services

in Russia and Belarus.”

6 LXF289 June 2022 www.linuxformat.com

VisionFive V1 RISC-V SBC on sale FILESYSTEM

Linux comes to the Apple M1 emergency recovery

www.techradar.com/pro/linux June 2022 LXF289 7

TOO Rolling Rhino

A new community remix of Ubuntu turns the

8 LXF289 June 2022 www.linuxformat.com

By the time you read

www.techradar.com/pro/linux June 2022 LXF289 9

10 LXF289 June 2022 www.linuxformat.com

Ordering is easy. Go online at:

Or get it from selected supermarkets & newsagents

Q Secrecy without conflict

A The exact method you use depends

12 LXF289 June 2022 www.linuxformat.com

www.techradar.com/pro/linux June 2022 LXF289 13

$ sudo apt install mkchromecast

14 LXF289 June 2022 www.linuxformat.com

Digital editions are also available on iOS, Android, and more

WRITE TO US Route of the problem

* For full terms and conditions see: www.futureplc.com/terms-conditions

16 LXF289 June 2022 www.linuxformat.com

LETTER OF THE MONTH

www.techradar.com/pro/linux June 2022 LXF289 17

PLUS: Exclusive access to 1

1) Only available to www.magazinesdirect.com subscribers

ANNUAL PRINT ANNUAL ANNUAL DIGITAL

SAVE! SAVE! SAVE!

www.techradar.com/pro/linux June 2022 LXF289 19

Seagate EXOS 20TB

20 LXF289 June 2022 www.linuxformat.com

www.techradar.com/pro/linux June 2022 LX289 21

22 LXF289 June 2022 www.linuxformat.com

Deep extra cover

www.techradar.com/pro/linux June 2022 LXF289 23