It looks like an IP address conflict since you are using 192.168.1.0/24 on both lans.
AllowedIPs also looks wrong. Openwrt should use 10.0.0.100/32 and ubuntu should use 10.0.0.254/32 (or 10.0.0.0/24) and 192.168.1.0/24.
2 Likes