>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
How do people solve this? What kind of permissions / configuration do you use?
Maybe I over-generalized the issue to all USB printers. My personal experience
is with an HP printer handled by hplip / hplip-plugin.
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