/etc/sane.d/lexmark.conf is in libsane 1.0.23-3ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # X11xx series
usb 0x043d 0x007c
# X12xx series
usb 0x043d 0x007d
# Dell A920
usb 0x413c 0x5105
# X74
usb 0x43d 0x0060
|