I am experiencing this problem too. using VNC (tigervnc-standalone-server). I read the entire thread. I tried damn near all of the workarounds. None worked.
The symptom is that I can't start Firefox in my xfce4 session . madbrain@u22041:~/Desktop$ firefox /system.slice/vncserver.service is not a snap cgroup Here is my xstartup : madbrain@u22041:~/.vnc$ cat xstartup #!/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 & And my systemd unit : [Unit] Description=Tiger VNC server After=syslog.target network.target [Service] Type=forking User=madbrain PIDFile=/home/madbrain/.vnc/%H:5902.pid ExecStartPre=-/usr/bin/vncserver -kill :2 > /dev/null 2>&1 ExecStart=/usr/bin/vncserver -geometry 3840x2160 -localhost no :2 ExecStop=/usr/bin/vncserver -kill :2 [Install] WantedBy=multi-user.target I think the issue is related to my systemd. If I start vncserver :2 from a terminal, then Tim's workaround from comment 31 works.* But if I start it through systemd, it fails. -- 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: Invalid Status in systemd package in Ubuntu: Confirmed 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) To manage notifications about this bug go to: https://bugs.launchpad.net/x2go/+bug/1951491/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
