Public bug reported:
It looks like snapd in ubuntu-core (2.26.14 here) has been modified to
use a negative Nice value in systemd. Systemd seems to treat a failure
to apply the requested Nice value as critical to unit startup.
Unprivileged LXD containers do not allow the use of negative nice values
as those are restricted to the real root user. I believe the optimal fix
would be for systemd to ignore permission errors when attempting to
setup such custom nice values in containers but if that can't be
resolved quickly, then it means that snapd will now fail to start inside
Aug 09 05:54:37 core systemd: snapd.service: Main process exited,
Aug 09 05:54:37 core systemd: snapd.service: Unit entered failed state.
Aug 09 05:54:37 core systemd: snapd.service: Failed with result 'exit-code'.
I have confirmed that setting up a unit override by hand which sets Nice=0 does
resolve the problem, confirming that the negative Nice value is the problem
(snapd.service has Nice=-5 here).
** Affects: snapd
** Affects: systemd (Ubuntu)
** Tags: lxd
** Also affects: systemd (Ubuntu)
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snapd 2.26.14 on ubuntu-core won't start in containers anymore
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