Comment 4 for bug 235670

I reverted the "/etc/udev/rules.d/40-permissions.rules" file back to:

# Printers and Parallel devices
SUBSYSTEM=="printer", GROUP="lp"
SUBSYSTEM=="ppdev", GROUP="lp"
SUBSYSTEM=="usb", KERNEL=="lp[0-9]*", GROUP="lp"

Afterwards, I was not able to print a test page and received the same error as before in the CUPS web configuration tool:

"Unable to open device file "/dev/lp0": Permission denied"

I then ran the command above:

jschindler@centime:~$ sudo aa-complain cupsd
[sudo] password for jschindler:
Setting /etc/apparmor.d/usr.sbin.cupsd to complain mode.

In complain mode, I'm still unable to print a test page.

jschindler@centime:~$ cat /var/log/syslog | grep "audit"
Jun 3 08:10:49 centime kernel: [ 29.995251] audit: initializing netlink socket (disabled)
Jun 3 08:10:49 centime kernel: [ 29.995267] audit(1212498624.236:1): initialized
Jun 3 08:10:52 centime kernel: [ 57.754790] audit(1212498652.982:2): type=1502 operation="inode_permission" requested_mask="a::" denied_mask="a::" name="/dev/tty" pid=5127 profile="/usr/sbin/cupsd" namespace="default"

If you need additional information from me, please let me know.