This file is indexed.

postrm is in update-notifier-common 3.168.

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.

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#!/bin/sh

set -e

dpkg-maintscript-helper rm_conffile /etc/update-motd.d/20-cpu-checker \
	0.110.1ubuntu1 -- "$@"