I completely new here; so please excuse my questions if they are too naive. I have an HP Z230-SFF Workstation, with Quadro K620, Intel i7-4790, running Ubuntu 16.04. It runs happily with 384.111. I run two screens one on the normal VGA; the other on the GPU output slot.
Upon installing Cuda 9.1, using the deb file, it replaced the 384 with 387. Then I got an error from Ubuntu that doesn’t specify anything, only saying that it is coming from propitiatory software.
Upon restart; the screen on GPU doesn’t come-up, after signing-in through GUI, I get the same error message, and logs me out immediately. So am unable to use GUI after that point.
As I didn’t know how to handle this I reinstalled Ubuntu fresh, and would like to try installing CUDA again, what should I do next time?