Am I right in understanding that apparmor in Questing has started to
ship a profile for fusermount3, which it didn't in Plucky, and this
completely breaks Flatpak?

This sounds like "Severely affects applications beyond the package
responsible for the root cause" and Importance: Critical is justified
then.

I don't know if there is time to fix this before release or not, but
even if not, Ryan please could you prepare an SRU urgently? I'll also
subscribe previous sponsors of this package: this is your
responsibility.

** Changed in: apparmor (Ubuntu)
   Importance: High => Critical

** Tags added: regression-release

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https://bugs.launchpad.net/bugs/2122161

Title:
  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:
  Unknown
Status in apparmor package in Ubuntu:
  Confirmed
Status in flatpak package in Ubuntu:
  Confirmed

Bug description:
  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)

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