[Bug 2131577] [NEW] Kubuntu 25.10 fails to install apps with fusermount3 error

[LinuxIsForAll]

Public bug reported:

Bazaar fails to install flatpak applications and throws this log:


(bazaar:2): BAZAAR::CURATED-PROVIDER-WARNING **: 00:03:23.438: Could not load curated config at path /run/host/etc/bazaar/config.yaml: Error opening file /run/host/etc/bazaar/config.yaml: No such file or directory

** (bazaar:2): WARNING **: 00:03:23.473: Failed to load blocklist from path '/run/host/etc/bazaar/blocklist.txt': Error opening file /run/host/etc/bazaar/blocklist.txt: No such file or directory
WARNING: Glycin running without sandbox.
Running fusermount wrapper, redirecting to host...
fusermount3: file descriptor 5 is not a socket, can't send fuse fd
Running fusermount wrapper, redirecting to host...
fusermount3: entry for /var/tmp/flatpak-cache-6ROYF3/org.kde.KStyle.Adwaita-6JSRF3 not found in /etc/mtab

(bazaar:2): BAZAAR::FLATPAK-WARNING **: 00:03:29.803: Transaction failed
to complete: Could not unmount revokefs-fuse filesystem at
/var/tmp/flatpak-cache-6ROYF3/org.kde.KStyle.Adwaita-6JSRF3: Child
process exited with code 1

(bazaar:2): Adwaita-WARNING **: 00:04:46.021: AdwNavigationPage 0x5c0fbf69b120 is missing a title. To hide a header bar title, consider using AdwHeaderBar:show-title instead.
WARNING: Glycin running without sandbox.
WARNING: Glycin running without sandbox.

I think this might be related to the issue on normal Ubuntu that broke
flatpak support in Ubuntu 25.10

** Affects: fuse3 (Ubuntu)
     Importance: Undecided
         Status: New

** Package changed: software-properties (Ubuntu) => fuse3 (Ubuntu)

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https://bugs.launchpad.net/bugs/2131577

Title:
  Kubuntu 25.10 fails to install apps with fusermount3 error

Status in fuse3 package in Ubuntu:
  New

Bug description:
  Bazaar fails to install flatpak applications and throws this log:

  
  (bazaar:2): BAZAAR::CURATED-PROVIDER-WARNING **: 00:03:23.438: Could not load curated config at path /run/host/etc/bazaar/config.yaml: Error opening file /run/host/etc/bazaar/config.yaml: No such file or directory

  ** (bazaar:2): WARNING **: 00:03:23.473: Failed to load blocklist from path '/run/host/etc/bazaar/blocklist.txt': Error opening file /run/host/etc/bazaar/blocklist.txt: No such file or directory
  WARNING: Glycin running without sandbox.
  Running fusermount wrapper, redirecting to host...
  fusermount3: file descriptor 5 is not a socket, can't send fuse fd
  Running fusermount wrapper, redirecting to host...
  fusermount3: entry for /var/tmp/flatpak-cache-6ROYF3/org.kde.KStyle.Adwaita-6JSRF3 not found in /etc/mtab

  (bazaar:2): BAZAAR::FLATPAK-WARNING **: 00:03:29.803: Transaction
  failed to complete: Could not unmount revokefs-fuse filesystem at
  /var/tmp/flatpak-cache-6ROYF3/org.kde.KStyle.Adwaita-6JSRF3: Child
  process exited with code 1

  (bazaar:2): Adwaita-WARNING **: 00:04:46.021: AdwNavigationPage 0x5c0fbf69b120 is missing a title. To hide a header bar title, consider using AdwHeaderBar:show-title instead.
  WARNING: Glycin running without sandbox.
  WARNING: Glycin running without sandbox.

  I think this might be related to the issue on normal Ubuntu that broke
  flatpak support in Ubuntu 25.10

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