Verification-done for zesty with nplan 0.29~17.04.1:
As for xenial, this is a fix for a regression introduced in a package that never actually made it to zesty. The regression does not appear in netplan 0.29~17.04.1 at all, I verified that the container with nplan upgraded properly gets both IPv4 and IPv6 addresses; and those are displayed in 'lxc ls'.
Verification-done for zesty with nplan 0.29~17.04.1:
As for xenial, this is a fix for a regression introduced in a package that never actually made it to zesty. The regression does not appear in netplan 0.29~17.04.1 at all, I verified that the container with nplan upgraded properly gets both IPv4 and IPv6 addresses; and those are displayed in 'lxc ls'.