Install nouveau-firmware by entering the following commands in the terminal:
sudo apt update sudo apt install nouveau-firmware
Description:
Firmware for nVidia graphics cards
Contains the firmware-like context programs for the open-source nouveau nVidia drivers. These are required for acceleration (both 2D and 3D) on nVidia cards of the nv40 generation and above (GeForce6 and above). . Although the nouveau drivers are now able to generate this firmware for nv40 generation cards this package still contains the nvidia context programs for debugging purposes. . This package is temporary; the nouveau drivers will soon be able to generate this data on the fly.
Homepage: http://nouveau.freedesktop.org
Version: 20091212-0ubuntu1
Section: multiverse/kernel