LXD containers don't start because of snap-confine has elevated permissions


The error message looks like this:

snap-confine has elevated permissions and is not confined but should
be. Refusing to continue to avoid permission escalation attacks

It's due to Apparmor and the kernel you're running. I remedied this with:

# apparmor_parser -r /etc/apparmor.d/*snap-confine*
# apparmor_parser -r /var/lib/snapd/apparmor/profiles/snap*

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