postrm is in freeradius-common 2.1.12+dfsg-1.2ubuntu8.
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 20 21 22 23 24 25 26 27 28 29 30 | #! /bin/sh
set -e
case "$1" in
        remove)
               ;;
        purge)
               rmdir --ignore-fail-on-non-empty /etc/freeradius
               # If we haven't managed to remove /etc/freeradius, make
               # sure that freerad:freerad doesn't own anything before
               # we remove the user and group
               test ! -d /etc/freeradius || find /etc/freeradius -user freerad -exec chown root "{}" \; || true
               test ! -d /etc/freeradius || find /etc/freeradius -group freerad -exec chgrp root "{}" \; || true
               if [ -x `which deluser` ]; then
                 deluser --quiet freerad shadow || true
                 deluser --quiet freerad || true
               fi
               if [ -x `which delgroup` ]; then
                 delgroup --quiet freerad || true
               fi
               ;;
         *)
               ;;
esac
exit 0
 |