postrm is in transmission-daemon 2.82-1.1ubuntu3.2.
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  | #!/bin/sh
set -e
case "$1" in
  purge)
    if [ -d /var/lib/transmission-daemon/info ]; then
      rm -rf /var/lib/transmission-daemon/info/*
    fi
  ;;
esac
# Automatically added by dh_systemd_enable
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask transmission-daemon.service >/dev/null
	fi
fi
if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		export _DEB_SYSTEMD_HELPER_PURGE=1
		deb-systemd-helper disable transmission-daemon.service >/dev/null
		deb-systemd-helper unmask transmission-daemon.service >/dev/null
	fi
fi
# End automatically added section
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