Comment 23 for bug 1001028

Even with the usblp kernel module blacklisted you are not able to print?

Please do tests for the case with the usblp module active and with the usblp module blacklisted and attach the error_log for both.

If you do not have a file /etc/modprobe.d/blacklist-cups-usblp.conf run the following command:

sudo apt-get install --reinstall cups

Please also check for stale "usb" processes via

ps auxwww | grep usb

and kill all "usb:..." processes. After all these eliminated, test again. Reboot if in doubt.