** Changed in: flatpak (Ubuntu)
Status: Confirmed => Invalid
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to apparmor in Ubuntu.
https://bugs.launchpad.net/bugs/2122161
Title:
[SRU] error: Failed to install org.gnome.Platform: Could not unmount
revokefs-fuse filesystem at /var/tmp/flatpak-
cache-4EB3B3/org.gnome.Platform-EM6KC3: Child process exited with code
1
Status in Flatpak:
Fix Released
Status in Release Notes for Ubuntu:
Fix Released
Status in apparmor package in Ubuntu:
Confirmed
Status in flatpak package in Ubuntu:
Invalid
Status in apparmor source package in Questing:
Fix Released
Bug description:
[ Impact ]
fusermount3 (and umount, which is invoked by it with the same
confinement) on the current Ubuntu Questing requires additional
privileges in order to work properly. In particular, the lack of these
privileges broke flatpak because it was newly no longer able to
unmount revokefs-fuse. (This is a distinct failure from a previous one
reported at LP: #2100295.)
[ Test Plan ]
On a Questing machine,
- Install flatpak following the instructions at
https://flathub.org/en/setup/Ubuntu:
- `sudo apt install flatpak`
- `flatpak remote-add --if-not-exists flathub
https://dl.flathub.org/repo/flathub.flatpakrepo
- Reboot
- Attempt to install a flatpak, e.g. `flatpak install flathub
com.github.huluti.Coulr`
- If installation is successful, attempt to run the flatpak with `flatpak run
com.github.huluti.Coulr`
- Without the fix:
- The flatpak installation fails and generates error messages about being
unable to unmount revokefs-fuse
- AppArmor generates denial logs relating to file accesses in
/run/mount/utab and related files /run/mount/utab.*
- With the fix: the installation succeeds
- AppArmor still generates denial logs relating to denials of the
DAC_OVERRIDE and SETUID capabilities. However, as flatpak still
seems to work properly even with these capabilities denied, we do not
grant fusermount3 these capabilities
[ Where problems could occur ]
The additions to the fusermount3 profile are loosening confinement.
However, if a user manually modified the installed profiles, then the
package upgrade would cause conflicts, and rejection of the incoming
changes (either by hand during an interactive upgrade or automatically
during an batch unattended upgrade) would result in end users not
getting the packaged fix.
[ Other Info ]
Original bug report:
hi i am a bug tester and wanted to install a program but then i got this error
here is my full log:
Warning: Could not unmount revokefs-fuse filesystem at
/var/tmp/flatpak-cache-4EB3B3/org.freedesktop.Platform.GL.default-FAB3B3: Child
process exited with code 1
Warning: Could not unmount revokefs-fuse filesystem at
/var/tmp/flatpak-cache-4EB3B3/org.freedesktop.Platform.GL.default-K8HAC3: Child
process exited with code 1
Warning: Could not unmount revokefs-fuse filesystem at
/var/tmp/flatpak-cache-4EB3B3/org.freedesktop.Platform.openh264-D0P4B3: Child
process exited with code 1
Warning: Could not unmount revokefs-fuse filesystem at
/var/tmp/flatpak-cache-4EB3B3/org.gnome.Platform.Locale-QP83B3: Child process
exited with code 1
Warning: Could not unmount revokefs-fuse filesystem at
/var/tmp/flatpak-cache-4EB3B3/org.gtk.Gtk3theme.Yaru-dark-M2N7B3: Child process
exited with code 1
error: Failed to install org.gnome.Platform: Could not unmount revokefs-fuse
filesystem at /var/tmp/flatpak-cache-4EB3B3/org.gnome.Platform-EM6KC3: Child
process exited with code 1
ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: flatpak 1.16.1-2ubuntu1
ProcVersionSignature: Ubuntu 6.17.0-3.3-generic 6.17.0-rc3
Uname: Linux 6.17.0-3-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.33.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Sep 5 20:07:19 2025
InstallationDate: Installed on 2025-09-04 (1 days ago)
InstallationMedia: Ubuntu 25.10 "Questing Quokka" - Daily amd64 (20250903)
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: flatpak
UpgradeStatus: No upgrade log present (probably fresh install)
To manage notifications about this bug go to:
https://bugs.launchpad.net/flatpak/+bug/2122161/+subscriptions
--
Mailing list: https://launchpad.net/~touch-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~touch-packages
More help : https://help.launchpad.net/ListHelp
