Change Default Linux/Unix Image Viewer Application

Use this complete guide to change the default image viewer application for a graphical desktop environment on a GNU/Linux or Unix operating system.

https://www.adamsdesk.com/posts/change-default-linux-unix-image-viewer/

#blog #KDE #XFCE #GNOME #linux #unix #tech

Alt...

Rays of light scatter down and outward through the blue and purplish water in the background. The foreground is made up of a group of three polaroids spread out like playing cards each with their own image viewer logo in the centre along with a strong title of 'Set Your Default Linux/Unix Image Viewer'.

I think we're only a few decades away:

"First rewrite Xlib, Xft, and all the Linux kernel dependencies." :)

#suckless #dwm #linux

By the way, our first two publications on evaluating #OpenBSD mitigations are out. Both of these papers evaluate some amd64 anti-ROP mitigations: specifically changing the register selection order and semantically equivalent rewriting of instructions that may produce a potential polymorphic gadget instruction. This tracks a paper by mortimer@ back in 2019 at AsiaBSDCon.

The TL;DR is "OpenBSD can shrink binaries a little and gain a little performance without any security loss simply by reverting these mitigations." The mitigations did not hold up to independent evaluation.

The first paper did an exact 1:1 port of these mitigations to FreeBSD and found that register reallocation eliminates only about 0.3% of unique gadgets, for a 0.5% increase in binary size (mortimer@ claimed 6% reduction and "entirely free"). It is useless at best but more likely actively detrimental, as it produces a false sense of security. It also found the instruction rewriting reduces unique gadgets by about 3.5% with a binary size increase of about 1.8% (mortimer@ claimed 5% reduction with 0.15% binary size increase).

We then did a separate implementation of the instruction rewriting mitigation to GCC in the second paper. Our GCC implementation does the older <xchg; op; xchg> dance, as that's what mortimer@'s paper described. This is way worse; producing about a 3% performance hit for no security benefit at all.

The only part of both mitigations worth saving is for basic arithmetic, OpenBSD LLVM now takes advantage of the fact that basic arithmetic has two forms. For example, the newer instruction rewriting mitigation turns
addq %rax, %rbx (48 01 c3)
into
{load} addq %rax, %rbx (48 03 d8)

The new instruction rewriting mitigation is genuinely free in terms of binary size and execution speed, but doesn't move the security needle, so this one can stay as it is harmless. Other rewritings still have the flaw of increasing binary size and reducing performance for no security benefit.

Anyhow feel free to read the papers:
https://ieeexplore.ieee.org/abstract/document/11458911
https://www.researchgate.net/publication/405728967_A_Final_Return_for_OpenBSD_Anti-Return-Oriented_Programming_Mitigations

#BSD #FreeBSD #NetBSD #DragonFlyBSD #Linux #Unix #security #cybersecurity

Series of publications on GPAC:
https://www.openwall.com/lists/oss-security/2026/05/30/2
https://www.openwall.com/lists/oss-security/2026/06/01/8
https://www.openwall.com/lists/oss-security/2026/06/01/9
https://www.openwall.com/lists/oss-security/2026/06/01/10
https://www.openwall.com/lists/oss-security/2026/06/01/11
https://www.openwall.com/lists/oss-security/2026/06/01/12
https://www.openwall.com/lists/oss-security/2026/06/01/13

#fuzzing #infosec #security #afl #revers #cybersecurity #bugbounty #vulnerability #opensource #linux #cve #advisory #media #filesystem

We're hiring! Several open roles for open source engineers:

🔲 GPU Consultant Engineer
🐧 Linux Kernel Consultant
🔊 Linux Audio Consultant Engineer
⚙️ Platform Engineering Consultant

Remote/anywhere · Full-time · Upstream-first culture since 2005 🐧

→ https://www.collabora.com/careers

#Hiring #OpenSource #FOSS #Linux #GPU #LinuxKernel #RemoteWork #EmbeddedLinux

Alt...

Collabora - We're hiring!

After being locked away for 10+ years in the Cloud; it's so refreshing, and frustrating to deal with all of the little things; like filesystems, database replication and locks, replacing fans and NICs, debugging OOMs, and crashing daemons on #FreeBSD, #OmniOS, and #Linux;

I feel like everything moves a little more slowly and sustainably this way; but most of all - I really missed getting lost in the details.

Live RIGHT NOW on The IT Guy Show: Live Ops 009.

We're walking through @xcpng and @xenorchestra , the open source virtualization stack from @vates. If you're still on VMware because you don't know what else to use, this one's for you.

Full install walkthrough, running it nested on Proxmox as a PoC.

Watch now: https://www.youtube.com/live/Uz04d9Z-Itg?si=E5Ywc-rDU5cmKWON
#Linux #OpenSource #Virtualization #Homelab #XCPng #VMware #SysAdmin #ITOps

Gambonanza masterfully combines Balatro and chess and it's out now https://www.gamingonlinux.com/2026/05/gambonanza-masterfully-combines-balatro-and-chess-and-its-out-now/

#Gambonanza #IndieGames #PCGaming #Linux

Dear #Linux,

It is frustrating not having SIGINFO when troubleshooting network problems.

Annoyed,

Someone who prefers a much better networking stack

📦 BackupPilot 1.0.1 ist veröffentlicht.

Neu mit erweiterter CLI, Pre- und Post-Backup-Hooks sowie offizieller ARM64-Unterstützung. Damit können z.B. Datenbank-Dumps direkt vor einem Backup erstellt und automatisch mitgesichert werden.

Pakete und Updates gibt es neu über unser Repository: https://repos.onesystems.ch

#BackupPilot #Proxmox #PBS #ARM64 #Linux #Gnome

@nixCraft I started off in the world of Gentoo because I wanted to run a 64 bit OS on my operating system when that wasn't an option using windows. Since then, I've moved off of Gentoo and now I use a variety of Distros like Mint, Ubuntu, Bazzite, etc on my different PCs.

I think the majority of #Linux users probably don't feel that strongly about their distro, but there's a vocal minority out there that make it look like we all do.

Why is #Linux like a religion? Everyone thinks their distro is the one true path, and they’ll die on that hill usually mid `apt upgrade`

Okay, hi everyone

This weekend, after a random toot from @alice in my TL, I found myself in a rabbit hole to enhance and create an iOS 6 theme for GTK4. It's not much, it has some rough edges, but damn it looks so cool, and I'm so proud of this!!

If you wanna help with design or add icons, please feel free to do so!

The code and install instructions lives here : https://gitlab.com/Krafting/igtk-theme

#gnome #gtk #libadwaita #ios #apple #gnomemobile #mobilelinux #retrocomputing #ios6 #linux #postmarketos

Alt...

Homescreen of GNOME mobile with ios6 styled icons and wallpaper

Alt...

Settings app with ios6 styled design

Alt...

Text Editor app with ios6 styled design

Alt...

Homescreen of GNOME mobile with ios6 styled icons and wallpaper

*** Repost on new instance ***

Hello Fediverse,

I'm happy to announce our very own Mastodon instance called "FediBlue", a new friendly place in the Fediverse for all people that are interested in free and open source software, especially Linux, BSD and illumos.

FediBlue is part of our ongoing effort to strengthen the FOSS community by publishing content about it and help projects gaining visibility in a time where many companies try to force their services on users, train AIs with people's data and collect as many data as they could.

Alongside the wonderful BSD Cafe community, where I'm also at, FediBlue should provide another very friendly and welcoming place in the Fediverse. In the next days, the Dark Blue Project presence will move completely to FediBlue.

https://mastodon.fediblue.de

#mastodon #opensource #freesoftware #linux #freebsd #openbsd #netbsd #illumos #darkblueproject #fediblue

Euro-Office, a fork of OnlyOffice backed by European vendors including Nextcloud and IONOS, is set to launch June 9 as a sovereignty-focused office suite. 🇪🇺
The project aims to provide an open-source alternative to Microsoft Office and Google Docs while supporting EU digital sovereignty efforts. 📄

🔗 https://fossforce.com/2026/05/euro-office-sets-june-9-launch-in-bid-for-eu-digital-sovereignty/

#TechNews #EuroOffice #Nextcloud #OnlyOffice #LibreOffice #DigitalSovereignty #OpenSource #EU #Europe #Cloud #Productivity #Privacy #Technology #Software #Linux #FOSS #ODF

Shoutout to the unpaid open source devs holding everything together.
You know who you are. We owe you more than a GitHub star.

#OpenSource #Linux #SysAdmin #MemeMonday

Last week I installed Linux onto a new laptop. Nothing special about that, but it got me thinking how with all the negative sides of technology we also have plenty of positive ones.

I downloaded a close to 5 gigabyte .iso from the distro's site, wrote it onto an USB drive with dd and booted off it. In less than 10 minutes later a working desktop installation was done.

The first computer I've ever installed Linux on was a 486. My modem was 2400bps so I did not download an .iso. Instead I went to bank, got US dollars, stuffed those and a order form I had clipped off a computer magazine into an envelope and mailed that. As fast as 3 weeks I was holding a CD box of Slackware, with two CDs and a booklet that was to become the source of frustration for months to come.

I recently installed Alpine onto an old Thinkpad I have at the arcade and that got me thinking if I still had it to build a system from scratch to that old Slackware level. I may have to find a period accurate PC and see how it all looked like back then. #linux

Latest 𝗩𝗮𝗹𝘂𝗮𝗯𝗹𝗲 𝗡𝗲𝘄𝘀 - 𝟮𝟬𝟮𝟲/𝟬𝟲/𝟬𝟴 (Valuable News - 2026/06/08) available.

https://vermaden.wordpress.com/2026/06/08/valuable-news-2026-06-08/

Past releases: https://vermaden.wordpress.com/news/

#verblog #vernews #news #bsd #freebsd #openbsd #netbsd #linux #unix #zfs #opnsense #ghostbsd #solaris #vermadenday

Latest 𝗩𝗮𝗹𝘂𝗮𝗯𝗹𝗲 𝗡𝗲𝘄𝘀 - 𝟮𝟬𝟮𝟲/𝟬𝟲/𝟬𝟴 (Valuable News - 2026/06/08) available.

https://vermaden.wordpress.com/2026/06/08/valuable-news-2026-06-08/

Past releases: https://vermaden.wordpress.com/news/

#verblog #vernews #news #bsd #freebsd #openbsd #netbsd #linux #unix #zfs #opnsense #ghostbsd #solaris #vermadenday

22 Uhr Abends, und mir fällt auf: `tldr` statt `man` ist wie der Unterschied zwischen "ich erkläre dir die ganze Philosophie des Befehls" und "hier sind die 5 Beispiele, die du wirklich brauchst".

`tldr tar` hat mir mehr Lebenszeit gerettet als jeder Energy-Drink. Endlich entpacke ich Archive ohne im Kopf nach der richtigen Buchstabensuppe zu kramen. 🗜️

Installiert via Paketmanager, gibt's für fast alles.

#Linux #CLI #FOSS

So I've been using Shotwell as my photo organizer for many years. But it's old, creaky and only barely supported.

What should I use instead? What do you use? I need:

* Photo management (sorting, ranking, deleting)

* Handles 10k+ images fine

* edit with external editor (gimp)

* RAW support

* Runs locally on Linux

* Ideally, import from camera

* Ideally, export to Flickr

* Ideally, a way to export from shotwell/import to the new organizer

Any ideas?

#fedihelp #photography #linux

@paul

There's also the part where you discover the Linux Documentation Project and the joy of doco that is convincing but a quarter century or more out of date when you check all of the version numbers of the stuff that it tells you about. (-:

@rl_dane
#Linux #LinuxDocumentationProject

sh
rlwrap ed

Arrow keys, command history, Ctrl-R search, and readline editing for programs that never had those features.

One of those small Unix tools that's easy to overlook.

#unix #linux #ed #commandline

xterm.vt100.translations: #override \
    Ctrl Shift <Key> equal: larger-vt-font() \n\
    Ctrl <Key> minus: smaller-vt-font() \n\
    Ctrl <Key> 0: set-vt-font(d) \n\
    Ctrl Shift <Key> C: copy-selection(CLIPBOARD) \n\
    Ctrl Shift <Key> V: insert-selection(CLIPBOARD)

xterm(1) on #Linux or #BSD doesn’t support easy font resize and CUA copy-paste? uhh.

Unix is a long-standing family of stable, multiuser, multitasking operating systems known for its command-line power and clean design. “Unix-based” means an OS directly descends from Unix code or certified Unix lineage

Here are known Unix-based OS 😎👇 Some are discontinued, while others are still active, especially in the BSD family

Find high-res pdf ebooks with all my #technology related infographics from https://study-notes.org

#linux #unix #freebsd #operatingsystem #computerscience

Hello Fediverse,

I'm happy to announce our very own Mastodon instance called "FediBlue", a new friendly place in the Fediverse for all people that are interested in free and open source software, especially Linux, BSD and illumos.

FediBlue is part of our ongoing effort to strengthen the FOSS community by publishing content about it and help projects gaining visibility in a time where many companies try to force their services on users, train AIs with people's data and collect as many data as they could.

Alongside the wonderful BSD Cafe community, where I'm also at, FediBlue should provide another very friendly and welcoming place in the Fediverse. In the next days, the Dark Blue Project presence will move completely to FediBlue.

https://mastodon.fediblue.de

#mastodon #opensource #freesoftware #linux #freebsd #openbsd #netbsd #illumos #darkblueproject #fediblue

How to add things such as wget and apt to Ubuntu 26.04 LTS in Linuxulator on FreeBSD?

https://www.reddit.com/r/Ubuntu/comments/1tz7dln/how_to_add_things_such_as_wget_and_apt_to_ubuntu/

What's the easiest way to install apt, in the absence of wget?

Alternatively: what's the easiest way to install wget, in the absence of apt?

#FreeBSD #apt #Linux #Linuxulator #Ubuntu

The NetBSD 🚩 Foundation wrapped up its 2026 AGM! 🚀 Quick recap of milestones & future plans:
📦 NetBSD-11 (RC4) is on the horizon.
🌳 The massive migration from CVS to Git/Mercurial is officially complete!
🎓 #GSoC2026: 5 students onboarded (working on Wi-Fi stack upgrades, porting the #Enlightenment desktop @E , and more).
🛡️ Security: Onboarding as a MITRE CNA, preparing for the EU CRA, and enforcing "Anti-Slop" (no unreviewed AI code) protocols.
🔬 Long-term: Long-term plans to use formal verification tools, with Core open to funding active code audits.

Full log: https://blog.netbsd.org/tnf/entry/annual_general_meeting_2026

#NetBSD #OpenSource #RunBSD #GSoC #Security #Linux #antiaislop #FormalVerifcation

I'ts been a fairly long time since i've used this acc but one of my friends told me I should promote a project i've been working on, so... yeah!

I wrote a 3ds homebrew that boots a full linux environment in a risc v emulator in a few c files and only aboout ~170kb of code including all of the builtin nonessential example stuff like a js environment, fizzbuzz, cli doom, and more.

it's called 3DS-CLI, and it can be installed from universal updater or built from source and manually installed, and it's all open source cause free software is awesome!

https://github.com/cmdada/3ds-cli

please interact with the github repo if you like it!

#RISCV #3ds #Homebrew #Linux #Emulation

Alt...

3ds-cli running on a red new nintendo 3ds xl listing files and having booted linux

Don't tell me you think #Linux #Documentation is adequate.

Go install CachyOS and somehow manage to change both the console font in Limine, and upon bootup, and then tell me the documentation is adequate.

I give up. I'll just squint while logging in. You'd think stuff would be smart enough to say "Gee, the screen is 1080p, maybe let's not use an 8x16 console font. 🤦‍♂️

California lawmakers are considering exempting Linux and other open-source operating systems from the Digital Age Assurance Act after backlash over OS-level age verification requirements 🏛️
Amendment could exempt major Linux distros, while proprietary platforms like SteamOS may still be covered 🐧

🔗 https://www.tomshardware.com/software/linux/california-moves-to-exempt-linux-from-its-upcoming-age-verification-law-after-backlash-over-forcing-operating-systems-to-collect-users-ages-amendment-proposed-by-the-same-lawmaker-who-wrote-the-original-law

#TechNews #Linux #OpenSource #Privacy #AgeVerification #California #SteamOS #Debian #Ubuntu #Fedora #ArchLinux #DigitalRights #FOSS #OperatingSystems #California #Bill #Law

Did you know - you can also grab free #Linux based VPS now!

We took your feedback seriously and instead of breaking the philosophy at #BoxyBSD, @gyptazy crafted the @BoxedTux project with the same spirit and philosophy.

Free Linux based instances for learning, testing and educational content. Supporting #Debian, #Ubuntu, #Fedora, #RockyLinux, #Devuan, #Suse and many more ones!

#BoxedTux is also powered by @gyptazy to support the community and beginners just focussing more on Linux based systems. No worries, #BoxyBSD remains as it is!

Website: https://boxedtux.com
Demo (YouTube): https://www.youtube.com/watch?v=-FEv3ANz5hc

#virtualization #community #education #learning #freevps #support #devops #bgp #dn42

Have you already enrolled on the Chat Mail service of BSD Café?

## No?

Go read enroll, have fun!

I've already enrolled / applied

Compliments of @stefano who did a massive amount of work to make this a full BSD experience from the server side.

This Café also runs in a BSD Jail

https://chatmail.bsd.cafe/index.html

#BSD #Café #Chat #Mail #service #programming #Linux #no #OpenSource #POSIX #fun #UniversalLove

@stefano
@jana

Thank you Jana for this great talk and introduction to FreeBSD.

#GPN24

#Linux #BSD #FreeBSD #RunBSD #Linux #OpenSOurce

Hello, BSD and Linux friends!

Don't miss @jana 's great presentation later today: "How is FreeBSD different from Linux, what does it do well and why should I care?"

The live stream can be found here: https://streaming.media.ccc.de/gpn24/vortragssaal

The recording will be available afterwards in: https://media.ccc.de/c/gpn24

https://cfp.gulas.ch/gpn24/talk/ZSNZ89/

#Linux #BSD #FreeBSD #RunBSD #Linux #OpenSOurce

@david_chisnall

2025 Schleswig-Holstein switched to Open Xchange, Thunderbird, LibreOffice and Nextcloud

2026 Schleswig-Holstein started to switch from windows to Linux 💪

#SchleswigHolstein #openxchange #Thunderbird #LibreOffice #linux

OK ... #Linux help needed.

I'm trying to update my 20.04 machine to 22.04, thence to 24.04. I've run:

$ apt update
$ apt upgrade

But I'm getting :

E: The repository 'https://repo.skype.com/deb stable Release' no longer has a Release file.

N: Updating from such a repository can't be done securely, and is therefore disabled by default.

Then when I try:

$ do-release-upgrade

I get:

Checking for a new Ubuntu release

Please install all available updates for your release before upgrading.

Help?

Should I somehow work to expunge all knowledge of skype (and I'd be more than happy to do that) or should I somehow force the upgrade?

TIA

Wondering if anyone knows of any good active virtual tech meetups? Like zoom calls, or maybe discord voice etc.. Anything related to #programming, #linux, etc. etc. I'm open to hearing about any and all. They seem hard to find..

🍁 Linux Association of Canada launches a national open-source library to support digital sovereignty. Read more: https://betakit.com/linux-association-of-canada-launches-national-open-source-library/ via @sarahcrgr
https://betakit.com/linux-association-of-canada-launches-national-open-source-library/ #OpenSource #DigitalSovereignty #Canada #Linux

This World Environment Day, combat e-waste by recycling your old tech with #NetBSD. Don't let planned obsolescence dictate your hardware's lifespan. Give that old machine a second life as a rock-solid firewall, file server, or lightweight workstation. 🖥️🌱
#WorldEnvironmentDay #NetBSD #RunBSD #RetroComputing #EcoFriendly #FOSS #Linux

Is there any good Linux (no Android) tablet out there? Sadly Fairphone doesn't offer one.

#linux #tablet

A hard line "I don't use anything with LLM generated code" stance will be difficult to maintain if you are a Linux user.

#Linux #LLM #AI

@rl_dane @ianthetechie and *raw* mobile #linux is nowhere near ready for primetime

J'ai #besoindevous dans le cadre du DU de Médiation de Lyon 2, je souhaiterais faire mon mémoire sur l’intérêt (ou pas) de la médiation pour favoriser le règlement des conflits dans le monde des logiciels libres

Je cherche une communauté francophone (de préférence)

1/ pour observer le fonctionnement et l’éventuelle existence de personnes jouant le rôle de médiateurices (rust conseillé sans le côté francophone 😅)

OU

2/ qui fait face à la prédation de sa production et qui a ou envisage de mettre en place une médiation pour faire évoluer la situation

Le rend les gens responsables et libres 🙃

#opensource #linux

Just...no

root@debhost:~# mount -o remount /
mount: (hint) your fstab has been modified, but systemd still uses
the old version; use 'systemctl daemon-reload' to reload.
root@debhost:~# systemctl daemon-reload
root@debhost:~# mount -o remount /
root@debhost:~#

#Linux #systemd #IT #SysAdmin

#linux #gcc #clang #c #cpp #poll 1) do you have a program called "a.out" in your home folder, and if so 2) do you remember what it was