I just ran into this problem as well. My USB printer wouldn't work, I
noticed "permission denied" in the logs.
I found something interesting in /etc/udev/rules.d/40-permissions.rules.
Line 12 reads:
SUBSYSTEMS=="usb", GROUP="plugdev"
Obviously, this puts all USB devices in the plugdev group. Further down
on line 37, though ,we see:
SUBSYSTEM=="usb", KERNEL=="lp[0-9]*", GROUP="lp"
The intention, obviously, is that USB printers be given the group lp
instead. However, this is not happening. Is there some sort of
incorrect assumption in the rules about the way they interact, or is
udev improperly applying the rules?
--
Permissions on /dev/usblp* don't agree with cupsys
https://launchpad.net/bugs/76077
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