This file is indexed.

postrm is in adduser 3.113+nmu3ubuntu4.

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

if [ "$1" = "purge" ]; then
    rm -f /etc/adduser.conf /etc/adduser.conf.dpkg-save
    if [ -e /usr/share/debconf/confmodule ]; then
        . /usr/share/debconf/confmodule
        db_purge
    fi
fi