I think I found the culprit: I was modifying an AppArmor profile for
Thunderbird. When I executed aa-logprof, I got the following message:
Enforce-mode changes:
Profile: /usr/sbin/cupsd
Capability: block_suspend
Severity: unexpected capability rank input: CAP_BLOCK_SUSPEND
If you select "Allow", you will run into the problem mentioned above.
I've no idea why creating/modifying a Thunderbird profile affects the
cupsd profile and why that capability is added.
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https://bugs.launchpad.net/bugs/1052098
Title:
AppArmor parser error for /etc/apparmor.d/usr.sbin.cupsd
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