All Nvidia drivers missing from Additional Drivers in Software & Updates

Running Ubuntu Mate 17.10

I only ever install drivers through Software & Updates. Currently have driver version 384.11 installed as viewable thru Nvidia XServer Settings (attached) Normally I can see a list of various Nvidia driver versions when I select Additional Drivers in Software & Updates. But all Nvidia references are now gone. Why?

Also, can any Ubuntu experts help me prune my PPA list.
What should I remove?
What should I add?

Hi art3mis,

you are looking at the wrong tab!:

As far as updating goes, check out the update guide: