preinst is in libsane-common 1.0.25+git20150528-1ubuntu2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
set -e
if [ "$1" = upgrade ]; then
#
# remove obsolete conffile
#
dpkg-maintscript-helper rm_conffile /etc/sane.d/v4l.conf 1.0.24-10 -- "$@"
fi
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