Lxc container is not getting ipv6 address

I am creating a lxc container by below command

but after creation it is not showing any ipv6 address

Problem is when i’m going to created a lxd bridge network inside lxc container it is showing some error:

What is it the issue ?

You could avoid this by also not using IPv6 in the container.
lxc network create br0 ipv6.address=none would do the trick.

Otherwise, the root of the error is that the ip6tables kernel modules aren’t loaded on your host. Loading those at boot time with some init script would also let you use IPv6 in the container.