postrm is in powermanagement-interface 0.3.21.
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 | #!/bin/sh
set -e
case "$1" in
 purge)
        rm -f /etc/default/pmi
        ucf --purge /etc/default/pmi
        ;;
 *)
        ;;
esac
 |