I've been using Kubuntu with Snap for quite a while and no bigger issues so far. Today all my snap apps stopped launching, reporting the following error:
/user.slice/user-1000.slice/session-3.scope is not a snap cgroup
How can I fix this?
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This appears to be a recent issue and hopefully if a bug will get fixed soon.
I am running KDE on MX 21 Wildflower (in
systemd mode to enable snap) and so have a similar OS as you.
I found a few references that I used to figure out the fix:
The main fix(es) appear to be to install
dbus-user-session, and to edit your
/etc/default/grub file with this line: (as sudo or root)
sudo apt install dbus-user-session
(first back up your
Then edit the line in /etc/default/grub as follows:
sudo update-grub and reboot.
Hopefully this works for you and I will follow this thread to see how it goes for others.