I just got a surprise warning:
root@OasisMega1:~# cupsd -t
Printer drivers are deprecated and will stop working in a future version of CUPS. See https://github.com/OpenPrinting/cups/issues/103
"/etc/cups/cups-files.conf" is OK.
"/etc/cups/cupsd.conf" is OK.
root@OasisMega1:~#
Canon UFR-II based printers will NOT print without a Canon-supplied proprietary printer driver.
Does anyone know if there is an emerging substitute for CUPS that will support Manufacturer drivers for printers?