Comment 10 for bug 1446982

I'm trying to help you out here, but you are making things more confusing than necessary.

If you can document clearly that Ubuntu 15.04 behaves differently from 14.10 in the shutdown sequence (e.g., perhaps Ubuntu 14.10's shutdown sequence sent a SIGTERM *before* cutting off the network, and Ubuntu 15.04 cuts off the network first), you might be able to get the systemd people interested again.

But you have to document it very clearly and change only one thing at a time.