>From my experience I think that cupsd executes backend tools with all uids and gids set to cups and no supplementary groups. In the case of USB printers the backends need to access /dev/usbctl and /dev/usb/foobar that corresponds to a printer. That means that the access to those devices must be somehow granted to cups:cups. How do people solve this? What kind of permissions / configuration do you use?
P.S. Maybe I over-generalized the issue to all USB printers. My personal experience is with an HP printer handled by hplip / hplip-plugin. -- Andriy Gapon
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