postrm is in systemtap-client 3.1-3ubuntu0.1.
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 -e
set -e
case "$1" in
purge)
	rm -rf /etc/systemtap/ssl/client
	rmdir /etc/systemtap/ssl 2> /dev/null || true
	rmdir /etc/systemtap 2> /dev/null || true
	;;
remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
	;;
*)
	echo "$0 called with unknown argument '$1'" >&2
	exit 1
	;;
esac
 |