In this case you may set:
accept-ra: no
In your netplan YAML; this will at least set IPv6AcceptRA=no, which should be sufficient for the bridge to come up, and is already available in netplan 0.34.1 (in Ubuntu 18.04)
Controlling LinkLocalAddressing= will remain as a TODO.
In this case you may set:
accept-ra: no
In your netplan YAML; this will at least set IPv6AcceptRA=no, which should be sufficient for the bridge to come up, and is already available in netplan 0.34.1 (in Ubuntu 18.04)
Controlling LinkLocalAddres sing= will remain as a TODO.