Hi,
Hi EG,
I was under the impression Linux graphics drivers were fairly baked into the OS?
Regards,
EDIT:
Thus rather more difficult to up/down grade
The graphic drivers tend to be in separate packages. Each release will have a base version included with it. With many packages there are cross dependencies which prevent going back to a version from a previous release. That said I would not expect a graphics driver to have many, if indeed any, cross dependencies.
What you may have to do is get the package source for the previous version and compile on 16.04.
At this point I have to say that my experience is on Centos/Red Hat which has different tools for package management than Ubuntu (which is a Debian derivative), so I cannot give you an Ubuntu Howto - sorry.
EG