snap-update-ns failed with code 1: File exists
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Description

When trying to run Clementine which is a snap package that has worked for months I get the following:

$ clementine 
cannot update snap namespace: cannot drop supplementary groups: operation not permitted
snap-update-ns failed with code 1: File exists

When refreshing the snaps I get:

$ snap refresh
All snaps up to date.

Please let me know if you need more from me and what that might be to solve this issue.

what's the output of snap --version?

$ snap --version
snap    2.35
snapd   2.35
series  16
solus   3.9999
kernel  4.18.5-90.current

AppArmor issue ?
Perhaps you could try sudo eopkg install --reinstall snapd + reboot ?

Reinstallation solved the problem. Thank you!