I installed 12.04LTS and have a DeskJet 1125C connected through USB.
The problem: Sometimes it does not print – in print jobs is status Pending/Processing but print does not start. I discovered if I print some documents then next document simply doesn't print with status processing or status pending. The only way is to disconnect printer from USB and immediately reconnect then works OK some times.
Ubuntu – Printer sometimes doesn’t print
12.04printingusb
Best Answer
In case it helps anyone, I have these same symptoms (print jobs go to pending and never print) unless my printer is turned on after Ubuntu starts up. Therefore, if I have print jobs pending, turning the printer off and then on again is enough to get them going.