[Bug 1951491] Re: Can't run snaps: .slice/session-1.scope is not a snap cgroup

[Tim Richardson]

I'm just an ordinary user trying to get this working and volunteering what I learn, so bear that in mind. I have no real clue about what the problem is and I still don't understand where in the session start process DBUS_SESSION_BUS_ADDRESS is set and why we get a wrong value when starting sessions with our remote access. 
 
I sent my workaround to nomachine since it has some advantages over their current solution of disabling cgroupv2. They said it works for them, and they have altered their tech note to say  the node.cfg could also be:

DefaultDesktopCommand "env
DBUS_SESSION_BUS_ADDRESS=unix:path=$XDG_RUNTIME_DIR/bus /usr/bin/startxfce4" 

I think you will recognise how to apply that. 
This seems to allow only one session per user. 

let me know if it works. I remember now I setup "loginctl enable-
linger", which may or may not be helping my solution.

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

Status in snapd package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Confirmed
Status in snapd package in Debian:
  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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