Ubuntu 20.04LTS安装Docker

//卸载已安装的旧版本
sudo apt remove docker docker-engine docker.io containerd runc

//配置apt https支持
sudo apt update
sudo apt install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

//添加docker官方的GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

//添加docker官方仓库地址
 echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

//安装docker
sudo apt update
sudo apt install docker-ce docker-ce-cli containerd.io

官方文档：Install Docker Engine on Ubuntu | Docker Documentation