1. 更新系統里的所有能更新的軟件，更新apt軟件包索引并安裝軟件包，以允許apt通過HTTPS使用存儲庫?

lizhichao@chaochao:~$ sudo apt-get update
lizhichao@chaochao:~$ sudo apt-get install \
> ? ? apt-transport-https \
> ? ? ca-certificates \
> ? ? curl \
> ? ? gnupg \
> ? ? lsb-release

2. 添加Docker的官方GPG密鑰

lizhichao@chaochao:~$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

3.lizhichao@chaochao:~$ echo \
? ? > ? "deb [arch=amd64 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

4. 更新apt軟件包索引，并安裝最新版本的Docker Engine和containerd，或轉至下一步安裝特定版本
?lizhichao@chaochao:~$ sudo apt-get update
lizhichao@chaochao:~$ ?sudo apt-get install docker-ce docker-ce-cli containerd.io

5. 要安裝特定版本的Docker Engine

lizhichao@chaochao:~$ systemctl start docker
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to start 'docker.service'.
Authenticating as: repchaochao (lizhichao)
Password:?
==== AUTHENTICATION COMPLETE ===
lizhichao@chaochao:~$ sudo docker run hello-world