I ran into a similar issue when trying to run LXD compiled from source. Issue is an abiliity to create a rule like so (when creating the default lxdbr0)
Error: Failed to create network "lxdbr0" in project "default": Failed to run: iptables -w -t mangle -I POSTROUTING -o lxdbr0 -p udp --dport 68 -j CHECKSUM --checksum-fill -m comment --comment generated for LXD network lxdbr0: iptables: No chain/target/match by that name.
My search seems to have led me to the same place as above. Is this resolvable/resolved?