pre_install() {

    groupadd -r -g 81 dbus
    useradd  -M -N -r -u 81 -g 81 -d / -s /sbin/nologin -c "system message bus" dbus
}

post_install() {

    ## Set permissions on dbus-daemon-launch-helper

    chown root:dbus /usr/lib/dbus-1.0/dbus-daemon-launch-helper
    chmod 4750 /usr/lib/dbus-1.0/dbus-daemon-launch-helper
}

post_upgrade() {

    post_install
}