Can you try the following:
Modify /etc/udev/rules.d/40-permissions.rules back to its old state,
without your workaround (/dev/lp0 should have owner root, group lp, and
660 permissions).
Now do
sudo aa-complain cupsd
Can you print now?
Can you post the messages containing "audit" in your /var/log/syslog?
You get back to the standard AppArmor configuration with
sudo aa-enforce cupsd
** Changed in: cupsys (Ubuntu)
Status: New => Incomplete
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Unable to print to parallel port
https://bugs.launchpad.net/bugs/235670
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