Well that worked excepting for a problem relating to the fact it was running in VirtualBox which meant that after the upgrade Cinnamon was running in software rendering mode. The solution is simple:

1. Download https://www.virtualbox.org/download/...3.13-93885.iso to the host drive
2. On the virtual machine run sudo apt-get purge virtualbox* and then reboot it. You will get a 640x480 resolution,
3. Once the file from step 1 has downloaded mount it using the devices menu in the virtual machine and let it auto run.
4. Reboot the VM.

It makes me wonder if upgrading that way would work better than the graphical tools in *ubuntu.