UPDATE: Following information may provide help
This issue occurred on my laptop which has two video cards, one is independent 
nvidia GPU and the other is integrated Intel one. I think this might cause the 
problem because on my other laptop only has one nvidia GPU, no such kind of 
issue occurred (Although on that laptop, the nvidia driver is not at the 
version of 390).

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https://bugs.launchpad.net/bugs/1769808

Title:
  System installed nvidia driver turned to black screen after upgrading

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