Our tutorials assume you have an Nvidia graphics card configured to use the proprietary driver.
There are many online guides for configuring the Nvidia driver correctly on Ubuntu.
You may test your driver installation by running nvidia-smi
in a terminal. If the command is not found, the driver is not installed correctly. Also test 3D Rendering with glxgears
which can be used after installing the mesa-utils
package with sudo apt install mesa-utils
.