This has absolutely nothing to do with upstart!
Most likely this is simply that Avahi is shipped disabled by default; check /etc/default/avahi-daemon and make sure you have AVAHI_DAEMON_START=1 in there
This has absolutely nothing to do with upstart!
Most likely this is simply that Avahi is shipped disabled by default; check /etc/default/ avahi-daemon and make sure you have AVAHI_DAEMON_ START=1 in there