I see this in the attached journal:
Oct 14 22:53:56 audit[1790]: AVC apparmor="DENIED" operation="open"
profile="snap-update-ns.lxd" name="/proc/1790/cgroup" pid=1790 comm="5"
requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Which is unexpectd as reading own /proc/<pid>/cgroup is allowed by the profile
generated by snapd.
Can you confirm that /var/lib/snapd/apparmor/profiles/snap-update-ns.lxd exist
in your system, and that in contains the following snippet?
```
# Allow reading own cgroups
@{PROC}/@{pid}/cgroup r,
```
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https://bugs.launchpad.net/bugs/1947203
Title:
Snap applications cannot start
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