Just found bug #85145 Should be enough to get you started.
-- add support for writeable read-only nfsroot through unionfs https://bugs.launchpad.net/bugs/28014 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
