/etc/sane.d/qcam.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 9 10 11 12 | #
# In order to use the qcam backend, you'll need to enable to line with
# the port address for your scanner. You can enable multiple lines if
# you really have a QuickCam connect to each port.
#
#u0x37b # /dev/lp0 forced in unidir mode
#u0x378 # /dev/lp1 forced in unidir mode
#u0x278 # /dev/lp2 forced in unidir mode
#0x37b # /dev/lp0
#0x378 # /dev/lp1
#0x278 # /dev/lp2
0x3bc # /dev/lp0
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