postrm is in sudo-ldap 1.8.21p2-3ubuntu1.
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 31 32 33  | #!/bin/sh -e
case "$1" in
  purge)
	rm -f /etc/sudo-ldap.conf
	rm -rf /var/lib/sudo
	rm -rf /run/sudo
  ;;
  remove|upgrade|deconfigure)
  ;;
  abort-upgrade|failed-upgrade)
    if [ -e "/etc/sudoers.pre-conffile" ]; then
        mv /etc/sudoers.pre-conffile /etc/sudoers
    fi
  ;;
  *)
        echo "unknown argument --> $1" >&2
        exit 0
  ;;
esac
# remove sudoers entries, if any, from nsswitch.conf
if [ -w /etc/nsswitch.conf ] ; then
	sed -i /^sudoers:/d /etc/nsswitch.conf
fi
# Automatically added by dh_installdeb/11.1.2ubuntu1
dpkg-maintscript-helper rm_conffile /etc/init.d/sudo 1.8.21p2-2\~ -- "$@"
# End automatically added section
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