Comment 6 for bug 1619258

setting this back to confirmed

this is definitely still an issue (and always has been), very easily to reproduce on a raspberry pi3 with Ubuntu Core that you only configure for wifi...

if you go with the defaults in the network config of subiquity the eth0 device stays enabled and defaults to dhcp but nothing in systemd will take into account if a physical wire is connected on boot so it will blindly wait for the interface to be up until the timeout hits.

adding something like "allow-hotplug" to nplan would solve this. alternatively simply having systemd-networkd check for physical status and skipping the unwired device would help too.