Comment 3 for bug 1817655

draft patch (not well tested yet), but I am having trouble because several of the tests (unrelated to this patch, they fail with the current git master) fail on disco, but not bionic.

Some of the tests fail when you run them a second time without opening a new terminal (even on bionic), I've addressed that with a PR here:
https://bugs.launchpad.net/netplan/+bug/1817660

The disco-specific failures seem to be largely ordering bugs where the output is re-ordered for some reason. I didn't dig into that yet. May be a better task for cyphermox