[amaccuish]

Yes I've done that and it definitely works, though I've still got "netcfg/do_not_use_netplan=true" in my cmdline for good measure, not sure if it does anything though, or even when I got that from, come to think of it.

But still, emptying a directory is not how I expect to disable what is a system service. It should be systemctl disable netplan...

I think emptying would be better than deleting the directory since it'll probably just get recreated on an update.

[nightfly]

It's because netplan uses a system generator /lib/systemd/system-generators/netplan, to parse the files in /etc/netplan and generate systemd-networkd configs from them on boot (Like how /etc/fstab gets parse into systemd mount units). It would be nice if there was a flag file or something you could touch to disable it though.