> The error_log file is empty.
Is this after trying to print something?

Since you are using a 3rd party driver, does it work after deactivating the 
AppArmor protection with this command on a terminal:
$ sudo aa-complain cupsd
You can reactivate the AppArmor protection again with this command:
$ sudo aa-enforce cupsd

-- 
Canon IP4200 not printing anymore after upgrade to 8.04
https://bugs.launchpad.net/bugs/236623
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