Comment 3 for bug 1737976

Not sure if that applies here, but "fe80::a8bb:ccff:fedd:eeff" is not a valid ipv6 address on this machine.

instead try "fe80::a8bb:ccff:fedd:eeff%ens3"

The problem might be with "systemd-resolved" which happily serves "fe80::a8bb:ccff:fedd:eeff" as an ipv6 address of this machine.

I stumbled over this ticket based on symptoms I saw (unrelated to netplan), and searching for some keywords...