Install Docker CE

1. Update the apt package index:

$ sudo apt-get update

2. Install packages to allow apt to use a repository over HTTPS:

$ sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common

3. Add Docker’s official GPG key:

$ curl -fsSL https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/gpg | sudo apt-key add -

#$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

$ sudo apt-key fingerprint 0EBFCD88

X86/amd64

4. Use the following command to set up the stable repository

$ sudo add-apt-repository \
   "deb [arch=amd64] https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

#$ sudo add-apt-repository \
#   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
#   $(lsb_release -cs) \
#   stable"

5. Install Docker CE

$ sudo apt-get update
$ sudo apt-get install docker-ce docker-ce-cli containerd.io

6. start Docker

$ sudo systemctl enable docker
$ sudo systemctl start docker