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1. Add the NVIDIA GPU driver PPA to your system:

Open a terminal window by pressing Ctrl + Alt + T keys on the keyboard.

Add the graphics-driver PPA:

sudo add-apt-repository ppa:graphics-drivers/ppa
This will provide info on the current long-lived branch release: `nvidia-xxx`

2. Install the current latest drivers for your system:

Ubuntu 18.04 and 20.04
sudo apt install nvidia-driver-xxx
Ubuntu 16.04
sudo apt update
sudo apt install nvidia-xxx
After installing the driver, restart your system:
sudo reboot

3. Check OpenCL driver

Execute the following command to get a synthetic summary about all OpenCL platforms on the system and the devices they expose:

Note: You first have to install clinfo.

/usr/bin/clinfo -l

If clinfo doesn't print anything, you might have to add your user to group Video.