I encountered black screen when login after ubuntu upgrade from 17.10 to 18.04
My tentative solution has been the following.
sudo apt install nvidia-cuda-toolkit
sudo apt install clinfo
sudo apt-add-repository ppa:graphics-drivers/ppa
sudo apt update
sudo apt upgrade
sudo reboot
nvidia-smi
clinfo
sudo apt install lightdm
(choose lightdm)
; countermeasurea black screen
sudo reboot
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