Comment 3 for bug 1643345

I spent some time going through posts and trying various things. The best I can reckon from all information gathered so far is something about the upgrade process from 14.04 to 16.04 trips things up for the Nvidia driver build. If Ubuntu 16.04 is installed from scratch, people report it works, but the part of it not working during / after an upgrade from a previous Ubuntu release is consistent. The thing is I have a system that has so much going on on it that starting over would be a huge time kill, so solving this would probably take less time even if it is a bit involved to figure out. Also if it is working on some installations and not others depending on how Ubuntu was installed, that points to a possible issue on the open source side tripping up things on the Nvidia side of the fence. (The notion here clean install of open source 16.04 equals proper environment for Nvidia driver to build while something off kilter about the Ubuntu upgrade process equals broken environment for the Nvidia driver to try to build in. Of course I also would not discount the notion that everything from each team runs to their internally defined spec, but two teams had two different ideas on the details of what is a valid thing to do / expect from the other.)