After a lot of digging, it seems that I have an unexpected, but simple
work-around for getting firefox to work under x2go on ubuntu 22.04:

Add to ~/.bashrc: 
unset DBUS_SESSION_BUS_ADDRESS

I tried putting this unset command in xinitrc right before xfce4-session
is run. No luck.

I tried the unset in a custom script that calls xfce4-session from x2go:
no luck.

I tried the unset in 95bdbu_update-activation-env: no luck.

It seems that xfce4-session is restoring the environment variable. This
is unexpected, and may represent a bug in xfce4-session, or possibly in
ubuntu's latest changes. I looked in the source for xfce4-session, but
it wasn't readily obvious that it was doing anything that would cause
this to be set.

I'd love to produce a proper fix if someone can give me a clue where to
look, but at least I/we have a quick work-around.

Can anyone else confirm that this fix works for them?

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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 snapd package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Incomplete
Status in x2goserver 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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