This bug was fixed in the package gnome-shell-extension-desktop-icons-ng
- 46+really47.0.9-1ubuntu2
---------------
gnome-shell-extension-desktop-icons-ng (46+really47.0.9-1ubuntu2) noble;
urgency=medium
[ Sergio Costas Rodriguez ]
* Add apparmor rules and update the thumbnail-factory API usage to make
thumbnails work again (LP: #2064849)
* Limit the number of templates and fix a continuous relaunch of the desktop
icons program when there are too many folders in the template folder
(LP: #2081198)
* Fix error when showing the preferences from the extensions application
(LP: #2061070)
-- Alessandro Astone <[email protected]> Mon, 23 Jun
2025 15:43:18 +0200
** Changed in: gnome-shell-extension-desktop-icons-ng (Ubuntu Noble)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2064849
Title:
Ubuntu 24.04 desktop icons ng image thumbnails no longer displayed
Status in Gnome Shell Extension Desktop Icons Ng:
Fix Released
Status in gnome-shell-extension-desktop-icons-ng package in Ubuntu:
Fix Released
Status in gnome-shell-extension-desktop-icons-ng source package in Noble:
Fix Released
Status in gnome-shell-extension-desktop-icons-ng source package in Oracular:
Fix Released
Status in gnome-shell-extension-desktop-icons-ng source package in Plucky:
Fix Released
Bug description:
Ubuntu Noble 24.04 desktop icons ng does not show thumbnails of pdf
and other image files.
I do not know if this bug is related to:
https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/2047256
that was fixed for nautilus.
No LSB modules are available.
Description: Ubuntu 24.04 LTS
Release: 24.04
gnome-shell-extensions:
Installed: 46.1-2
Candidate: 46.1-2
Version table:
*** 46.1-2 500
500 http://archive.ubuntu.com/ubuntu noble/universe amd64 Packages
500 http://archive.ubuntu.com/ubuntu noble/universe i386 Packages
100 /var/lib/dpkg/status
[ Impact ]
This bug prevents Desktop Icons to create thumbnails of the files
placed in the desktop. Thumbnails are important because they allow to
identify at a glance the content of some files, like pictures or PDF
documents.
This bug happens because the desktop application relies on the gnome-
desktop library thumbnail functions, which make use of `bwrap` to
launch each thumbnailer. The problem is that bwrap requires
unprivileged user namespaces, but in Ubuntu 23.10 it was restricted
for security reasons, and each program wanting to use it require an
exception for apparmor.
[ Test plan ]
To test the patch, first be sure to be running the Desktop Icons
extension distributed in a .deb package with Ubuntu. It won't work
with the ones installed directly from the Gnome Extensions web page.
To check it, you can use the "gnome-extensions-app" program.
Copy some files that allow thumbnailing (like pictures, or PDF files)
to the Desktop folder.
Open a terminal and type `rm -rf ~/.cache/thumbnails` to delete all
the current thumbnail files.
Type `ps ax | grep ding` to find the PID of the desktop icons process.
Use `kill XXXX` (being XXXX the PID of the desktop icons process) to
kill it, and force a desktop reload.
If the patch works, the files will have thumbnails (if they support
them); if it doesn't work, all the files will show the default icon
for their file type.
[ Were problems could occur ]
If there is a typo in the apparmor definition file, in the best-case
scenario thumbnails won't work.
In the worst-case scenario, a different program could receive
permissions to use unprivileged user namespaces.
A bug in the desktop icons program could lead to a program with access
to unprivileged user namespaces.
To manage notifications about this bug go to:
https://bugs.launchpad.net/gnome-shell-extension-desktop-icons-ng/+bug/2064849/+subscriptions
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