postrm is in gerstensaft 0.3-4ubuntu2.
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 | #! /bin/sh
set -e
test -x /usr/bin/update-menus && /usr/bin/update-menus || /bin/true
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