PC-TECH from @Staudey 's thread:
"I will shortly switch our main Nvidia driver package to the new 510.xx branch in the Unstable repository. Since Nvidia has removed support for the Kepler generation of cards (and older) from this version, you'll unfortunately have to manually switch to the new legacy Nvidia 470 driver packages if you use an affected GPU, otherwise it won't work after the next sync to the Stable/Shannon repository (presumably Friday).
This is a hopefully mostly complete list of cards which have dropped out of support (taken from the "Supported Products" section of the Nvidia driver website):"
your 700 series is on the chopping block/no longer supported list after that colon. that's what happened.
He goes on
:If you use the linux-current kernel and 32-bit drivers:
sudo eopkg it nvidia-470-glx-driver-current nvidia-470-glx-driver-32bit
If you use the linux-current kernel but no 32-bit drivers:
sudo eopkg it nvidia-470-glx-driver-current
If you use the linux-lts kernel and 32-bit drivers:
sudo eopkg it nvidia-470-glx-driver nvidia-470-glx-driver-32bit
If you use the linux-lts kernel but no 32-bit drivers:
sudo eopkg it nvidia-470-glx-driver"
what does all this mean you ask? it answered my question of 'which driver' and if you are a typical user that first offering that I put in formatted code is for you. (but read all 4 and decide).
