Comment 6 for bug 1302437

To the HPLIP developers at HP: The "hp" and "hpfax" backends seem not to handle gracefully the case if they are run on a computer without USB or if the USB kernel modules are not loaded (server/high security environments). libusb fails to initialize but the HP backends try to access the connection which libusb failed to establish.

If libusb initialization fails, the backend should skip the USB printer detection with an empty result.