Comment 7 for bug 1567440

> We also can't default on any subnet, that's the whole point of lxdbr0, defaulting on a subnet has been breaking user network in the past

How is that, OOI? postinst/debconf/etc. should certainly check if there's an existing 10.0.3.x network already, and not set up a default lxdbr0 then (or use a different IP). I. e. were these breakages because of conflicts with an existing network in that range, or something else?

> We do suggest a subnet in all those questions though, typing in those values will get you working networking.

Could the input lines at least be pre-filled with those, instead of/in addition to showing them in the text?