postrm is in grub-invaders 1.0.0-12.
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 | #!/bin/sh
set -e
if [ -x "`which update-grub2 2>/dev/null`" ]; then update-grub2 ; fi
exit 0
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