postrm is in maas-common 2.4.0~beta2-6865-gec43e47e6-0ubuntu1.
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 23 24 25 26 | #!/bin/sh
set -e
case "$1" in
    purge)
        # Deleting user/group
        if getent passwd maas >/dev/null; then
            deluser maas || true
            delgroup maas || true
        fi
        rm -rf /var/log/maas/maas.log
        rm -rf /var/lib/maas/gnupg
        rm -rf /var/lib/maas/secret
        rm -rf /var/lib/maas/maas_id
esac
rm -f /etc/rsyslog.d/99-maas.conf
# Automatically added by dh_installdebconf/11.1.6ubuntu1
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
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