For systems with GPU
please verify you have nvidia drivers installed.
Run
nvidia-smi
Drivers are installed if you see following.
If drivers are not installed, you can do so using following command:
sudo apt-get install nvidia-driver-YYY nvidia-dkms-YYY
where,
YYY
= Nvidia driver version
e.g sudo apt-get install nvidia-driver-510 nvidia-dkms-510
Reboot
your system after installing nvidia-drivers.
sudo reboot
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