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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
2. Install the current latest drivers for your system:
sudo apt install nvidia-driver-xxx
sudo apt update
sudo apt install nvidia-xxx
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.
If clinfo doesn't print anything, you might have to add your user to group Video.