I used the following command to make the CANON LBP-2900 printer work
with Gutsy, which also might do the trick for you:

sudo chown lp:lp /var/ccpd/fifo0

Somehow the file /var/ccpd/fifo0 was set to owner 'root' instead of 'lp'
after the update to Gutsy or the new version of CUPS cannot work with
device files set to owner 'root'. I'm not sure which one it is. Anyway,
the printer works again!

-- 
[Gutsy] Canon LBP-810 / LBP-1120 :  "Can't open FIFO: Permission denied"
https://bugs.launchpad.net/bugs/148173
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Bugs, which is the bug contact for Ubuntu.

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