Hi, I just compiled the 4.0.0 kernel from experimental with the following Ubuntu patch:
https://lists.ubuntu.com/archives/kernel-team/2014-February/038091.html (issue #293 on the lxc-github links to the same patch under a different url. https://lists.ubuntu.com/archives/kernel-team/2014-February/038811.html The target seems to have shifted since that message was posted.) Unfortunately, the resulting kernel is still not able to launch unprivileged ephemeral containers. If you let me know what other information would be helpful to debug this, I'll gladly provide it. cheers --manuel