preinst is in pm-utils 1.4.1-9.
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 | #!/bin/sh -e
if [ "$1" = "install" -o "$1" = "upgrade" ] && \
dpkg --compare-versions "$2" lt-nl "1.3.0~rc3-2"; then
# 1.3~ versions prior to this had a broken quirks DB evaluation or
# stored the cache file at the wrong location, so force an update
rm -f /etc/pm/last_known_working.quirkdb
fi
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