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Starting from version 1.4, cups now uses libusb and printer USB devices instead of the usblp generated /dev/usb/lpX ones. In order to not require the cups USB backend to run as root now, change raw USB printer devices to be root:lp 0660, similar to usblpX devices. This might also enable the hplip backend to not run as root, since this has always used raw device nodes. https://launchpad.net/bugs/420015