安装docker时报错：Package ‘docker-ce‘ has no installation candidate
安装docker，报错：$ sudo apt-get install docker-ce docker-ce-cli containerd.io
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
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
E: Package 'docker-ce' has no installation candidate
E: Unable to locate package docker-ce-cli
E: Unable to locate package containerd.io 首先实验更新，并重新安装
sudo apt-get update && apt-get upgrade
sudo apt-get install docker-ce docker-ce-cli containerd.io 如果依旧报错，说明apt的源设置的不对。
安装阿里云证书，并配置阿里云的docker源：
curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add - #安装阿里云gpg证书
cd /etc/apt/sources.list.d #在指定目录下新建docker.list文件，添加阿里云镜像源
sudo touch docker.list
sudo chmod 666 docker.list
sudo echo "deb https://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable" > docker.list 更新软件源，重新安装docker，等待安装完成：
sudo apt-get update #更新软件源
sudo apt-get install docker-ce docker-ce-cli containerd.io #重新安装docker
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