prerm is in rcconf 3.1ubuntu1.
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 14 15 16 17 18 19  | #!/bin/sh
#
# This is the rerm script for the Debian GNU/Linux rcconf package
# Written by Atsushi Kamoshida <kamop@debian.org>
#
set -e
case "$1" in
    remove|upgrade|purge)
        if [ -e /usr/bin/rcconf ]; then
            rm /usr/bin/rcconf
        fi
        ;;
    *)
        ;;
esac
exit 0
 |