/etc/sane.d/canon630u.conf is in libsane 1.0.22-7ubuntu1.
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 | # Options for the canonusb backend
# Autodetect the Canon CanoScan FB630u
usb 0x04a9 0x2204
# device list for non-linux-systems (enable if autodetect fails):
#/dev/scanner
#/dev/usb/scanner0
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