The problem seems to be a kernel (or perhaps udev) problem, as already "lsusb" ( no CUPS involved) has problems to access your printer.
Can you reboot your system, to assure that any process hammering on the US gets killed?
The problem seems to be a kernel (or perhaps udev) problem, as already "lsusb" ( no CUPS involved) has problems to access your printer.
Can you reboot your system, to assure that any process hammering on the US gets killed?