/etc/sane.d/epsonds.conf is in libsane-common 1.0.25+git20150528-1ubuntu2.
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 | # epsonds.conf
#
# here are some examples for how to configure the epsonds backend
# USB
usb
# For libusb support for unknown scanners use the following command
# usb <product ID> <device ID>
# e.g.:
# usb 0x4b8 0x14c
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