I have tried this again and the error is different now. I've attached a debug log.
** Attachment added: "start_test.out" https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1543697/+attachment/4587021/+files/start_test.out -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to lxc in Ubuntu. https://bugs.launchpad.net/bugs/1543697 Title: Unprivileged nested Xenial container will not start inside a privileged Xenial container To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1543697/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs