Dnsmasq currently only listens on 127.0.0.1; that's done on purpose. If the only nameserver you have is 127.0.0.1, both IPv4 and IPv6 queries will go through it. It doesn't listen on an IPv6 address. We'll likely change the actual address to '127.0.1.1' as soon as this is possible with dnsmasq, there are changes coming up upstream that should support this.br /br /Letting dnsmasq listen on IPv6 is definitely something I wouldn't mind to see working; but it's unfortunately not as simple as adding '--listen-address=::1' to the parameters passed to dnsmasq by NetworkManager.
If you’re one of the rare species still wanting Thunderbird in Ubuntu as described in Jorge Castro’s recent post, you can help. I am more worried about Jorge’s other comments, following his logic Ubuntu and free software are only less and less relevant by the day – not a trend I am observing.