Ubuntu 20.04 Upgrade nVidia graphics card issue.

fix_nvidia_driver_ubuntu_20.04.md

Scenario

• Upgraded to Ubuntu 20.04 from Ubuntu 18.04
• Previously the graphics card was shown nVidia in Ubuntu about section
• Now its llvmpipe (LLVM 10.0.0, 256 bits) / llvmpipe (LLVM 10.0.0, 256 bits)

Solution

• Install all necessary drivers:

sudo ubuntu-drivers autoinstall

• You may get the following error:

E: Unable to correct problems, you have held broken packages.

To solve the error update and auto remove packages:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get autoremove

Try to auto install the required drivers again:

sudo ubuntu-drivers autoinstall

(Optional) Hide mounted drive icon from left dock:

gsettings set org.gnome.shell.extensions.dash-to-dock show-mounts false

Scenario

Ubuntu 24.04 secure boot option refrains nvidia-smi to get access to nvidia GPU.

nvidia-smi
NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running

Solution

• To resolve that a Machine Owner Key (MOK) needs to be generated. Press Tab to go to Ok button in the following prompt and then set a key.

sudo update-secureboot-policy --enroll-key

• Reboot the machine.
• Choose Enroll key > Continue > Password and enter the same key you registered earlier.

References

• SO answer for enabiling the nvidia driver
• Secureboot doc ubutun