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[TomAwezome <1951491@xxxxxxxxxxxxxxxxxx>]

I've run into this bug today as well. The workflow was: Firefox (via
snap) was working as expected, I ran Virtualbox, the OOM killer
terminated my open Firefox and Librewolf (via apt/dpkg) instances,
finished using the VM, went to open back up Firefox and Librewolf.
Librewolf opened back up as normal, but Firefox won't launch. When
running `firefox` in the terminal, I get this output:

`/user.slice/user-1000.slice/session-1239.scope is not a snap cgroup`

At no point was I logged out of my session. The output of `snap list`
shows my system has the youtube-dl snap installed, and now running that
gives the same error on launch as above. Interestingly, the `codium`
snap does not have this issue, and launches normally as expected.

I see some mention of VNC in the conversation above; my
`xtightvncviewer` functionality is not affected by any of this. Also
mentioned above seems to be comments about login being "done by their
remote access tool": I'm affected by this bug and am not using any form
of a remote access tool for logging in. Login/display manager appears to
be SDDM.

I'm using the Lubuntu flavor of Ubuntu, customized with WindowMaker
installed as the window manager. Display server is X11. This issue
occurred in an active session, where after login programs were
functional for multiple days, and during the session suddenly the error
appeared.

I don't get any new log output from `journalctl --user` after running
`firefox`.

My system info and command outputs:

```
tom@tom:~$ uptime
 13:01:35 up 20 days, 13:55, 22 users,  load average: 0.63, 0.81, 0.81

tom@tom:~$ lsb_release -a; uname -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.5 LTS
Release:        22.04
Codename:       jammy
Linux tom 5.15.0-156-generic #166-Ubuntu SMP Sat Aug 9 00:02:46 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

tom@tom:~$ echo $DBUS_SESSION_BUS_ADDRESS
unix:path=/run/user/1000/bus

tom@tom:~$ ls -l /run/user/1000/bus
srw-rw-rw- 1 tom tom 0 Oct  9 10:58 /run/user/1000/bus

tom@tom:~$ systemctl --user
Failed to connect to bus: Connection refused

tom@tom:~$ systemd --user
Failed to create /user.slice/user-1000.slice/session-1239.scope/init.scope control group: Permission denied
Failed to allocate manager object: Permission denied
```

Happy to provide other command outputs or full logs at request, hope
this helps to further document this bug.

-- 
You received this bug notification because you are a member of
Debcrafters packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1951491

Title:
  Can't run snaps: .slice/session-1.scope is not a snap cgroup

Status in X2Go:
  New
Status in Xpra Terminal Server:
  New
Status in snapd package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  Invalid
Status in x2goserver package in Ubuntu:
  Incomplete
Status in snapd package in Debian:
  New
Status in snapd package in Fedora:
  New

Bug description:
  I just upgraded from hirsute to impish using do-release-upgrade. On
  the upgraded system, I can't run either firefox or chromium (both of
  which worked fine under hirsute). Both fail with:

  /user.slice/user-NNN.slice/session-1.scope is not a snap cgroup where
  NNN is my uid

  With firefox, I was able to fix the problem with:

  snap remove --purge firefox
  apt purge firefox
  apt install firefox

  Now firefox works. But I tried the same thing substituting chromium-
  browser for firefox, and it didn't help: chromium fails with the same
  error message.

  I guess there must be something left over from the hirsute version of
  snapd that isn't getting noticed or cleared by the impish version?

  Someone suggested this might be related to bug 1850667, but that bug
  is marked fixed as of a couple months ago, and I just did this upgrade
  today. Also, it doesn't mention the error message I'm seeing.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: snapd 2.53+21.10ubuntu1
  ProcVersionSignature: Ubuntu 5.13.0-21.21-generic 5.13.18
  Uname: Linux 5.13.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu71
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Thu Nov 18 18:12:45 2021
  InstallationDate: Installed on 2020-04-29 (568 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: snapd
  UpgradeStatus: Upgraded to impish on 2021-11-18 (0 days ago)

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