I saw that these were "free" in the AppCenter, so I clicked on them all. The next boot resulted in the black screen several people experience. I managed to (finally) get back to a working system, but don't ask me how. So, (1) is it possible to get rid of them from the list shown in the figure and (2) how do I know if I am using the best driver for my video card (Nvidia GEForce GTX 570) Thanks
I recommend installing the latest Nvidia drivers that support your graphics card. I have similar drivers available on my laptop and use the
nvidia-driver-390package which works very well.