I will be taking scientific7 down for imaging tonight around 10pm (I will wait if it is actively in use at that time) for about 25 minutes. I had intended to get to it with the other machines last night but problems with one of the host machines booting properly prevented it.
There appears to be an issue with the version of systemd on these machines. If it has only been operating for a while, it works correctly, but if it’s been up for a week or more, it often hangs during a run level change. I am seeing the same behavior on my workstation which is also Ubuntu 15.10.