Comment 42 for bug 1706052

Yes,
@{PROC}/*/cmdline r,
and resetting to enforce fixed the printing problem. For the record, the same solution also worked for a problem I was having with the dhclient apparmor profile that was stopping NetworkManager from connecting.

As for 17.10 Artful, I'm not entirely willing to do that just yet. I upgraded to Zesty only to attempt to fix a Bluetooth audio problem (it didn't) without testing the waters first, and got spanked for it. It's taken me a week just to root out the critical bugs.

As for HPLIP systray, I feel it might be related, since systray will work with apparmor set to complain on cups (both with and without the profile edit), but not when set to enforce. Nonetheless, I will file a bug with HPLIP.