I have got the same problem! I installed the package (python-qt3) via synaptic. This works, but then hplip says "No installed HP devices found". Can you confirm this too?
** Changed in: hplip (Ubuntu) Status: Unconfirmed => Confirmed -- HPLIP failed to start PyQt/Qt missing https://launchpad.net/bugs/67892 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs