There is a high possibility that a cuda driver error has occurred. At this time, from the login screen
ctrl+alt+f4
sudo apt-get --purge remove nvidia-*
sudo apt-get --purge remove cuda-*
Download the driver for your PC from nvidia's official website. It's a good idea to save the downloaded driver as it may cause problems again. nvidia official website
Execute the downloaded executable file
./Nvidia-Linux-x86-64-(number).run
To stop the GUI
sudo service lightdm stop
Do this, then run the downloaded executable again.
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