Installing and Uninstalling CUDA and CUDNN on Ubuntu

You have provided a detailed introduction to installing CUDA 11.8 and CUDNN 8.9.6 on the Ubuntu system, and verified it through a simple PyTorch program. To ensure the completeness of the documentation and facilitate others' reference, I have organized and supplemented your content. ### Installation Environment - **Operating System**: Ubuntu 20.04 - **Python Version**: 3.7.13 ### Step 1: Install CUDA 11.8 1. **Add Repository Source**: