preinst is in gnome-applets 3.4.1-0ubuntu1.
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 11 12 13 | #!/bin/sh
set -e
prog=/usr/bin/cpufreq-selector
case "$1" in
install|upgrade)
if dpkg --compare-versions "$2" lt-nl "2.24"; then
if dpkg-statoverride --list $prog > /dev/null; then
dpkg-statoverride --remove $prog
fi;
fi
esac
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