[09:06] <slyon> PeGaSuS: can you try using a "to: default", "via: 2001:470:1f20:a::1" route? This should be the proper replacement for your "gateway6" setting
[16:07] <PeGaSuS> slyon: that won't interfere with the default netplan config from the host?
[20:27] <PeGaSuS> apparently with the suggested setting I can't use the native assigned IPv6 address, only the ones from tunnelbroker