postrm is in cobbler-web 2.2.2-0ubuntu33.
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 10 11 12 13 14 15 16 17 18 19 20 21 22  | #!/bin/sh
set -e
if [ "$1" = "purge" ] ; then
    rm /var/www/cobbler_webui_content
    # Remove symlinks created for apache
    if [ -h /etc/apache2/conf.d/cobbler_web.conf ]; then
        rm -rf /etc/apache2/conf.d/cobbler_web.conf
    fi
    # now that configuration is gone, restart apache w/o it
    if [ -f /etc/init.d/apache2 ]; then
	if [ -x /usr/sbin/invoke-rc.d ]; then
		invoke-rc.d apache2 restart || true
	else
		/etc/init.d/apache2 restart || true
	fi
    fi	
fi
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