Public bug reported:
Not an Ubuntu release goes by where AppArmor does not appear to mess
things up...
This time I'm unable to set a background image. It just shows an even
colour. The colour set depends on the colours used in the image.
dmesg output show the following when changing the wallpaper:
--------------------------------------------------------------------------------
[ 420.040191] audit: type=1400 audit(1762857297.514:289): apparmor="AUDIT"
operation="userns_create" class="namespace" info="Userns create - transitioning
profile" profile="unconfined" pid=13694 comm="bwrap" requested="userns_create"
target="unprivileged_userns" execpath="/usr/bin/bwrap"
[ 420.040914] audit: type=1400 audit(1762857297.515:290): apparmor="DENIED"
operation="capable" class="cap" profile="unprivileged_userns" pid=13698
comm="bwrap" capability=8 capname="setpcap"
[ 420.040958] audit: type=1400 audit(1762857297.515:291): apparmor="DENIED"
operation="capable" class="cap" profile="unprivileged_userns" pid=13698
comm="bwrap" capability=12 capname="net_admin"
--------------------------------------------------------------------------------
Creating an AppArmor file with the following fixes the issue:
--------------------------------------------------------------------------------
abi <abi/4.0>,
include <tunables/global>
profile bwrap /usr/bin/bwrap flags=(unconfined) {
userns,
# Site-specific additions and overrides. See local/README for details.
include if exists <local/bwrap>
}
--------------------------------------------------------------------------------
I don't know if it's a good idea to add it like this, but at least it
works.
I don't know to which application this should be files against. Bug #2125226,
which is likely related, has glycin and gnome-shell.
Ubuntu-bug does not allow me to file it against bwrap itself because it's
apparently not installed.
Let me know if you need any more info.
ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: gnome-shell 49.0-1ubuntu1
ProcVersionSignature: Ubuntu 6.17.0-6.6-generic 6.17.1
Uname: Linux 6.17.0-6-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: GNOME
Date: Tue Nov 11 11:54:53 2025
DisplayManager: gdm3
InstallationDate: Installed on 2023-08-15 (819 days ago)
InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Release amd64 (20230418)
RelatedPackageVersions: mutter-common 49.0-2ubuntu5
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to questing on 2025-11-09 (2 days ago)
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug questing wayland-session
** Description changed:
Not an Ubuntu release goes by where AppArmor does not appear to mess
things up...
This time I'm unable to set a background image. It just shows an even
colour. The colour set depends on the colours used in the image.
dmesg output show the following when changing the wallpaper:
+
--------------------------------------------------------------------------------
[ 420.040191] audit: type=1400 audit(1762857297.514:289): apparmor="AUDIT"
operation="userns_create" class="namespace" info="Userns create - transitioning
profile" profile="unconfined" pid=13694 comm="bwrap" requested="userns_create"
target="unprivileged_userns" execpath="/usr/bin/bwrap"
[ 420.040914] audit: type=1400 audit(1762857297.515:290): apparmor="DENIED"
operation="capable" class="cap" profile="unprivileged_userns" pid=13698
comm="bwrap" capability=8 capname="setpcap"
[ 420.040958] audit: type=1400 audit(1762857297.515:291): apparmor="DENIED"
operation="capable" class="cap" profile="unprivileged_userns" pid=13698
comm="bwrap" capability=12 capname="net_admin"
+
--------------------------------------------------------------------------------
Creating an AppArmor file with the following fixes the issue:
+
--------------------------------------------------------------------------------
abi <abi/4.0>,
include <tunables/global>
profile bwrap /usr/bin/bwrap flags=(unconfined) {
- userns,
+ userns,
- # Site-specific additions and overrides. See local/README for details.
- include if exists <local/bwrap>
+ # Site-specific additions and overrides. See local/README for details.
+ include if exists <local/bwrap>
}
+
--------------------------------------------------------------------------------
I don't know if it's a good idea to add it like this, but at least it
works.
I don't know to which application this should be files against. Bug #2125226,
which is likely related, has glycin and gnome-shell.
Ubuntu-bug does not allow me to file it against bwrap itself because it's
apparently not installed.
Let me know if you need any more info.
ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: gnome-shell 49.0-1ubuntu1
ProcVersionSignature: Ubuntu 6.17.0-6.6-generic 6.17.1
Uname: Linux 6.17.0-6-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: GNOME
Date: Tue Nov 11 11:54:53 2025
DisplayManager: gdm3
InstallationDate: Installed on 2023-08-15 (819 days ago)
InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Release amd64 (20230418)
RelatedPackageVersions: mutter-common 49.0-2ubuntu5
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to questing on 2025-11-09 (2 days ago)
--
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https://bugs.launchpad.net/bugs/2131068
Title:
Background image is not working, showing even colour
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