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

[Jamie Davis]

For those of us who are using Xubuntu, X2Go and experiencing this
problem, I have a work-around:

I had already switched firefox to the apt repository version, so I
installed the chromium snap to test with. As expected, it failed to
launch with the same issue mentioned at the top of this thread:

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

So, I added this file:

/etc/x2go/Xsession.d/96dbus-snap-fix

containing:
export DBUS_SESSION_BUS_ADDRESS="unix:path=$XDG_RUNTIME_DIR/bus"

After logging out and back in via X2Go, the Chromium snap worked. It is
my hope that this fixes snaps for ALL users without having to edit
individual user login files (like .bashrc).

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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:
  Confirmed
Status in systemd package in Ubuntu:
  Incomplete
Status in x2goserver package in Ubuntu:
  Confirmed
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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