Comment 14 for bug 1902960

Here is a pastebin of the situation and how I tried to resolve this : https://pastebin.ubuntu.com/p/c6cfKqvBmN/

Unfortunately, the interface stays "unmanaged".

When I check the netplan source (https://github.com/CanonicalLtd/netplan/blob/master/netplan/cli/commands/apply.py#L128), it just stops systemd-networkd service, then start it after generating the file.