https://youtu.be/iH7whVK8fNk

0. Check your system environment

• Check your Ubuntu version

> lsb_release -a

• Check your CUDA, GPU driver is installed properly.

> nvidia-smi
> nvcc --version

• You also can check driver version on Software & Updates tool in Window.
  • In my case, driver version is 460.80

Reference how to install CUDA on ubuntu:

• link1 : Installing CUDA 10.1 on Ubuntu 20.04
• link2 : Installing Tensorflow with CUDA & cuDNN GPU support on Ubuntu 20.04 and charge through your Linear Algebra calculations

1. Preparation