Ubuntu LXD container: no IP address
sudo dpkg-reconfigure -p medium lxdBe very careful, this will wipe any existing lxc/lxd bridge you have and make your existing containers unreachable. So this is really only recommended if you are using LXD for the first time on your machine.
See comment section of https://www.stgraber.org/2016/03/11/lxd-2-0-introduction-to-lxd-112/
"This change was required to be able to decouple LXD from the old LXC tools, moving it onto its own bridge. The warning message was highlighting the reasons for that, the effect it would have on existing containers and how to configure it so things would work as usual."