Another datapoint. Just upgraded a laptop from 20.04 to 22.04.

1 - the laptop itself has no problem running Chromium or Firefox. When
run from a terminal, DBUS_SESSION_BUS_ADDRESS is
'unix:path=/run/user/1000/bus'

2 - When connecting over vnc, using the 'normal' xstartup (which must
have been on the net for 15-odd years), I see exactly this problem, but
for 'session-5.scope'. DBUS_SESSION_BUS_ADDRESS is
'unix:abstract=/tmp/dbus-
joEHty7pAj,guid=64e54e1c9ccf659527b095906389fcc0'. This xstartup is
shown as config (1) below

3 - I'm using tigervnc. If I don't have a ~/.vnc/xstartup it defaults to
/etc/X11/Xtigervnc-session (see /etc/tigervnc/vncserver-config-
defaults). This is shown as config (2) below. When using this default,
Chromium and Firefox work Ok, with the 'correct'
DBUS_SESSION_BUS_ADDRESS

Ergo this is just one more problem with vnc/remote desktop setup, which
is almost entirely unsupported on Ubuntu, Debian, and RedHat. Clearly
the people running on bare metal have a slightly different issue, but I
bet it has the same root cause. With config (1), I also get a pop-up
saying that 'The application IBus Preferences has closed unexpectedly'.
Note also, while I'm complaining, that this is the second snap issue
that I've had to deal with today to get 22.04 running (see
https://github.com/snapcore/snapd-desktop-
integration/issues/23#issuecomment-1335072721). I also do a server image
for 22.04.1, which has snap completely removed (because it is, in more
ways than one, a waste of space), but Canonical seem to be going out of
their way to make this impossible on desktop (ironic, since snap was
meant to be for servers).

Config 1:

#!/bin/sh
# Start up the standard system desktop
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS

#/usr/bin/startxfce4
/usr/bin/gnome-session

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
x-window-manager &

Config 2:

#! /bin/sh

test x"$SHELL" = x"" && SHELL=/bin/bash
test x"$1"     = x"" && set -- default

if test -r /etc/default/keyboard &&
   test -x /usr/bin/setxkbmap; then
  . /etc/default/keyboard
  /usr/bin/setxkbmap \
    -model   "${XKBMODEL}" \
    -layout  "${XKBLAYOUT}" \
    -variant "${XKBVARIANT}" \
    "${XKBOPTIONS}"
fi

tigervncconfig -iconic &
"$SHELL" -l <<EOF
exec /etc/X11/Xsession "$@"
EOF
tigervncserver -kill $DISPLAY



** Bug watch added: github.com/snapcore/snapd-desktop-integration/issues #23
   https://github.com/snapcore/snapd-desktop-integration/issues/23

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You received this bug notification because you are a member of Ubuntu
Touch seeded 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 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

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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