After installing the proprietary nvidia-340 driver in Ubuntu 18.04 on an Nvidia 630M laptop and rebooting, the computer went "zen" and got a black screen.
You need to go to the terminal. I only know 2 ways:
1. Ctrl+Alt+F1, but it didn't work for me.
2. Via Recovery Mode. Through this method, it turned out to reach the terminal.
Next, we log in as our user (if required) and need to remove the installed driver:
sudo apt-get remove nvidia-340
In my case it was the nvidia-340 driver, but there could be 390 and 331 etc.
Next
reboot
Resources just in case, with other causes of black screen after installing drivers: .
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