The upgrade appears mostly to have been a success. However, on the web server it broke NFS version 4 so I’m currently running version 3. I know this has to be something broken in my configuration because it is working properly on another 16.04.1 server here.
I had hoped it would resolve the MySQL hanging and dying thing but it did not even though it replaced it with a newer version so I will continue to troubleshoot that. I have some ideas on how to narrow it down but it will take some time as I have to wait for it to fail on it’s own as I do not yet know what induces a failure.