Running mint 19.3 cinnamon (this is an upgrade from 18.3).
As I was having issues launching a game I thought I would try a different graphics driver (340) as listed in the driver manager.
The change was not allowed and when I tried to return to the recommended 390 driver I was told that the following dependences were not on the system.
Depends: libnvidia-gl-390 but it is not installed
nvidia-driver-390 : Depends: libnvidia-gl-390 (= 390.138-0ubuntu0.18.04.1)
I have tried repairing them through the “Package manager” I am told they can not be installed.
I tried installing them through apt and I am told there is a conflict with the 340 driver.
Also tried install the 390 driver package from Nvidia.
Any clues please how I can restore the dependencies.