下面方法已失效
sudo add-apt-repository ppa:deadsnakes/ppa && sudo apt update && sudo apt install python3.6
输出：
E: Unable to locate package python3.6-dev E: Couldn't find any package by glob 'python3.6-dev' E: Couldn't find any package by regex 'python3.6-dev'
需要修改新源
sudo add-apt-repository ppa:fkrull/deadsnakes
