Does 'lxcbr0' exist on your machine? I see this from your attachment: LXD_BRIDGE="lxcbr0".
Please could you attach the output of:
$ ifconfig -a $ ip route
Does 'lxcbr0' exist on your machine? I see this from your attachment: LXD_BRIDGE= "lxcbr0" .
Please could you attach the output of:
$ ifconfig -a
$ ip route