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1. 先卸载旧版，如果没有的话，就不用执行了，直接第二步。

sudo apt-get update
sudo apt-get remove docker docker-engine docker.io containerd runc

2. 在终端输入

sudo apt-get update
sudo apt-get install ca-certificates curl gnupg lsb-release

3. 安装证书

curl -fsSL http://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -

4. 写入软件源信息

sudo add-apt-repository "deb [arch=amd64] http://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"

如果此处报错：

ubuntu add-apt-repository command not found

解决的方法安装software-properties-common

apt-get install software-properties-common

5. 安装

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

如果报错：

Package docker-ce is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source

打开 /etc/apt/sources.list.d/

docker

.list 中添加下面内容

deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable

6. 启动docker

systemctl start docker

7. 安装工具

apt-get -y install apt-transport-https ca-certificates curl software-properties-common

8. 重启docker

service docker restart

9. 查看docker版本

sudo docker version