/etc/sane.d/leo.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 | # The FS-1130 respond to all luns
scsi ACROSS * Scanner * * * 0
# LEO S3
scsi "LEO" "LEOScan-S3"
/dev/scanner
|