1.1 安装基础依赖
sudo apt-get install software-properties-common
1.2 添加源并更新
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt update
1.3 安装特定版本Python&pip3
sudo apt install -y python3.8
sudo apt install -y python3-pip
1.4 配置软链接
sudo ln -s /usr/bin/python3.8 /usr/bin/python