If you followed the tutorial from any other sources, make sure you remove NVIDIA driver and undo whatever you did. I have observed broken systems if you mixed various methods on the same system.

If you use a GUI or apt CLI method, do not try other commands. See “ Linux Find Out Graphics Card Installed In My System” for more info. You must have Nvidia GPU card detected by your system. Type the hwinfo command/lshw command to find out info about your GPU Naturally, you can only install Nvidia driver if you have Nvidia GPU in your system. Let us see all commands and step-by-step instructions in details. Reboot the computer/laptop to load the drivers.OR type “ sudo apt install nvidia-driver-515 nvidia-dkms-515” at the CLI.Open “ Software and Updates” app to install install Nvidia driver using GUI.You can install Nvidia drivers either using GUI or CLI method.Update your system running apt-get command.The procedure to install proprietary Nvidia GPU Drivers on Ubuntu 16.04 / 17.10 / 18.04 / 18.10 / 20.04 / 22.04 LTS is as follows:

Newest geforce driver