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
Status in “cups” package in Ubuntu:
New
Bug description:
My HP printer suddenly didn't work anymore, and /var/log/syslog
reported for udev-configure-printer:
"failed to connect to CUPS server; giving up"
I decided to reinstall cups and hplip and got the following error
messages:
"AppArmor parser error for /etc/apparmor.d/usr.sbin.cupsd in
/etc/apparmor.d/usr.sbin.cupsd at line 18: Invalid capability
block_suspend."
... and:
"start: Job failed to start
invoke-rc.d: initscript cups, action "start" failed."
... resulting in errors related to dpkg (dependencies problems).
After commenting out the line
capability block_suspend,
in /etc/apparmor.d/usr.sbin.cupsd, all is well: Reinstalling cups and
hplip was successful and my printer works again.
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https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1052098/+subscriptions
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