Please add the line
/dev/bus/usb/ r,
to the /usr/sbin/cupsd section of /etc/apparmor.d/usr.sbin.cupsd. Very
important is the slash in the end of /dev/bus/usb/.
After that restart AppArmor with
sudo /etc/init.d/apparmor reload
and return CUPS into enforce mode:
sudo aa-enforce cupsd
USB printing should now work correctly.
I have committed this fix to the Debian BZR repository of CUPS. Will be
part of the next CUPS package.
** Changed in: udev (Ubuntu)
Status: In Progress => Fix Committed
** Changed in: udev (Ubuntu)
Status: Fix Committed => Triaged
** Changed in: cups (Ubuntu Karmic)
Status: Triaged => Fix Committed
** Changed in: udev (Ubuntu)
Status: Triaged => In Progress
--
usblp Kernel module needs to be removed and /dev/bus/usb/*/* made accessible
for USB printers to work with CUPS 1.4.x
https://bugs.launchpad.net/bugs/420015
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