This file is indexed.

postrm is in lsb-release 9.20170808ubuntu1.

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

case "$1" in
    purge)
        if [ -e /etc/lsb-release ]; then
            MD5SUM=`md5sum /etc/lsb-release | cut -d" " -f1`
            if [ "$MD5SUM" = "b5bfe10d9b02fb4e4a45337d1c4d88ab" ]; then
                rm -f /etc/lsb-release
            fi
        fi
        ;;
esac