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):
NVIDIA TITAN Series:
GeForce GTX TITAN, GeForce GTX TITAN Black, GeForce GTX TITAN Z
GeForce 700 Series:
GeForce GTX 780 Ti, GeForce GTX 780, GeForce GTX 770, GeForce GTX 760, GeForce GTX 760 Ti (OEM), GeForce GT 740, GeForce GT 730, GeForce GT 720, GeForce GT 710
GeForce 600(M) Series:
All of them
Quadro Series:
Quadro K6000, Quadro K5200, Quadro K5000, Quadro K4000, Quadro K4200, Quadro K2000, Quadro K2000D, Quadro K600, Quadro K420, Quadro 410
GRID Series:
GRID K520
(Quadro) NVS Series:
NVS 510
If you use one of these cards, to switch to the nvidia-470-glx-driver package set open a terminal and enter one of these commands (whichever applies to your setup):
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
