Daniel Lange's blog (Entries tagged as trixie)

Getting AVIF thumbnails in XFCE4 thunar (Debian Trixie)

nospam@example.com (Daniel Lange) — Mon, 07 Sep 2026 08:50:00 +0000

The AVIF image format gets more and more popular in the web dev community, so I needed to teach XFCE4's thunar (file manager) and Ristretto (image viewer) to thumbnail these.

Luckily that is not too hard:

Debian Trixie separates its gdk-pixbuf libraries slightly differently than previous versions. That's why it is not "automatically there". Ensure you have the libavif-gdk-pixbuf plugin and the tumbler service (which XFCE uses to process thumbnails):

sudo apt --update install libavif-gdk-pixbuf tumbler

Thunar has likely tried (and failed) to load your AVIF files before you installed the package, it will have saved a blank or "broken image" placeholder in a thumbnail cache directory. It will not attempt to regenerate them unless you clear this cache:

# Clear the thumbnail cache
rm -rf ~/.cache/thumbnails/*

# Force-quit thunar and the tumblerd background service
thunar -q
pkill tumblerd

Tumbled will restart on its own when it is needed. When you open thunar again and navigate to your image directory ... your AVIF images will now generate thumbnails automatically like the other image format did already.

Getting scanning to work with Gimp on Trixie

nospam@example.com (Daniel Lange) — Wed, 24 Dec 2025 09:00:00 +0000

Trixie ships Gimp 3.0.4 and the 3.x series has gotten incompatible to XSane, the common frontend for scanners on Linux.

Hence the maintainer, Jörg Frings-Fürst, has disabled the Gimp integration temporarily in response to a Debian bug #1088080.

There seems to be no tracking bug for getting the functionality back but people have been commenting on Debian bug #993293 as that is ... loosely related .

There are two options to get the Scanning functionality back in Trixie until this is properly resolved by an updated XSane in Debian (e.g. via trixie-backports):

Lee Yingtong Li (RunasSudo) has created a Python script that calls XSane as a cli application and published it at https://yingtongli.me/git/gimp-xsanecli/. This worked okish for me but needed me to find the scan in /tmp/ a number of times. This is a good stop-gap script if you need to scan from Gimp $now and look for a quick solution.

Upstream has completed the necessary steps to get XSane working as a Gimp 3.x plugin at https://gitlab.com/sane-project/frontend/xsane. Unfortunately compiling this is a bit involved but I made a version that can be dropped into /usr/local/bin or $HOME/bin and works alongside Gimp and the system-installed XSane.

So:

sudo apt install gimp xsane
Download xsane-1.0.0-fit-003 (752kB, AMD64 executable for Trixie) and place it in /usr/local/bin (as root)
sha256sum /usr/local/bin/xsane-1.0.0-fit-003
# result needs to be af04c1a83c41cd2e48e82d04b6017ee0b29d555390ca706e4603378b401e91b2
sudo chmod +x /usr/local/bin/xsane-1.0.0-fit-003
# Link the executable into the Gimp plugin directory as the user running Gimp:
mkdir -p $HOME/.config/GIMP/3.0/plug-ins/xsane/
ln -s /usr/local/bin/xsane-1.0.0-fit-003 $HOME/.config/GIMP/3.0/plug-ins/xsane/xsane
Restart Gimp
Scan from Gimp via File → Create → Acquire → XSane

The source code for the xsane executable above is available under GPL-2 at https://gitlab.com/sane-project/frontend/xsane/-/tree/c5ac0d921606309169067041931e3b0c73436f00. This points to the last upstream commit from 27. September 2025 at the time of writing this blog article.

Debugging help

(added 06.05.2026)
As some people in the comments seem to have issues with getting the plugin to work on their systems:

Run $HOME/.config/GIMP/3.0/plug-ins/xsane/xsane --version as a shell command line.

This should output:

xsane-1.0.0 (c) 1998-2022 Oliver Rauch
  E-mail: Oliver.Rauch@xsane.org
  package xsane-1.0.0-fit-003
  compiled with GTK-3.24.49
  with color management function
  with GIMP support, compiled with GIMP-3.0.4
  XSane output formats: jpeg, pdf(compr.), png, pnm, ps(compr.), tiff, txt

If it doesn't, the shell may tell you what step of the instructions you missed (e.g. the +x attribute) or the loader shows what library you are missing on your system.

Make `apt` shut up about "modernize-sources" in Trixie

nospam@example.com (Daniel Lange) — Sat, 03 May 2025 12:22:00 +0000

Apt in Trixie (Debian 13) has the annoying function to tell you "Notice: Some sources can be modernized. Run 'apt modernize-sources' to do so." ... every single time you run apt update. Not cool for logs and log monitoring.

And - of course - if you had the option to do this, you ... would have run the indicated apt modernize-sources command to convert your sources.list to "deb822 .sources format" files already. So an information message once or twice would have done.

Well, luckily you can help yourself:

apt -o APT::Get::Update::SourceListWarnings=false will keep apt shut up. This could go into an alias or your systems management tool / update script.

Alternatively add

# Keep apt shut about preferring the "deb822" sources file format
APT::Get::Update::SourceListWarnings "false";

to /etc/apt/apt.conf.d/10quellsourceformatwarnings .

This silences the notices about sources file formats (not only the deb822 one) system-wide. That way you can decide when you can / want to migrate to the new, more verbose, apt sources format yourself.

Update 06.06.2025

I looks like the powers that are have had mercy, apt 3.0.2 has migrated to Trixie two days ago and the Changelog contains:

Downgrade "modernize-sources" notice to audit