按照各大网站以及个人习惯我会使用下面这种方法添加Docker源：

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

然而使用上面这条命令给我带来了无尽的烦恼，甚至我都怀疑我是不是一个合格的linux工程师了，使用了这条命令提示以下错误：

	Ign:1 https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu eoan InRelease
	Err:2 https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu eoan Release
	Not Found [IP: 218.104.71.170 443]
	Hit:3 http://cn.archive.ubuntu.com/ubuntu eoan InRelease
	Hit:4 http://cn.archive.ubuntu.com/ubuntu eoan-updates InRelease
	Hit:5 http://cn.archive.ubuntu.com/ubuntu eoan-backports InRelease
	Hit:6 http://cn.archive.ubuntu.com/ubuntu eoan-security InRelease
	Reading package lists... Done 
	E: The repository 'https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu eoan Release' does not have a Release file.
	N: Updating from such a repository can't be done securely, and is therefore disabled by default.
	N: See apt-secure(8) manpage for repository creation and user configuration details.

下面是apt源文件中的内容：

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

发现是没有任何错误的，但是你会发现在使用apt更新时会出现各种各样报错，最终还是没有你想要的docker-ce安装包，还是无法安装：

	root@uduntu:~# apt-get update
		Get:1 http://cn.archive.ubuntu.com/ubuntu eoan InRelease [255 kB]
		Get:2 http://cn.archive.ubuntu.com/ubuntu eoan-updates InRelease [88.4 kB]
		Hit:3 http://cn.archive.ubuntu.com/ubuntu eoan-backports InRelease
		Get:4 http://cn.archive.ubuntu.com/ubuntu eoan-security InRelease [92.9 kB]
		Ign:5 https://download.docker.com/linux/ubuntu eoan InRelease                                                                                                              
		Err:6 https://download.docker.com/linux/ubuntu eoan Release                                                                                                                
		Not Found [IP: 13.225.103.32 443]
		Reading package lists... Done                                                                                                                                              
		E: The repository 'https://download.docker.com/linux/ubuntu eoan Release' does not have a Release file.
		N: Updating from such a repository can't be done securely, and is therefore disabled by default.
		N: See apt-secure(8) manpage for repository creation and user configuration details.
	root@uduntu:~# apt search docker-ce
	root@uduntu:~#

遇到这种问题我也觉得很头疼，在网上找了很多解决方法都是不行，有人都说是网络问题无法使用外网的源码库，我看到这个文章我都懵了，我还试过安装网易、阿里以及科大的源都不能更好的解决问题，其实这个很简单看一下阿里、科大和网易的他们的源码库是怎么往配置文件里面写的，然后比葫芦画瓢画一个不就完了

解决方法：

在sources.list添加下面这一条就可以：

	deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable
	//然后下载安装相关密钥
	curl -fsSL http://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/gpg | sudo apt-key add -

更新apt源：

	root@uduntu:~# apt-get  update
		Get:1 http://cn.archive.ubuntu.com/ubuntu eoan InRelease [255 kB]
		Get:2 http://cn.archive.ubuntu.com/ubuntu eoan-updates InRelease [88.4 kB]
		Hit:3 http://cn.archive.ubuntu.com/ubuntu eoan-backports InRelease
		Get:4 http://cn.archive.ubuntu.com/ubuntu eoan-security InRelease [92.9 kB]
		Get:5 https://download.docker.com/linux/ubuntu bionic InRelease [64.4 kB] 
		Get:6 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages [9,594 B] Fetched 511 kB in 11s (48.3 
	B/s) 
		Reading package lists... Done
	root@uduntu:~#

这样就好了，不报错了，再看看docker-ce这个安装包有没有：

	root@uduntu:~# apt search docker-ce
		Sorting... Done
		Full Text Search... Done
		docker-ce/bionic,now 5:19.03.4~3-0~ubuntu-bionic amd64 [installed]
		Docker: the open-source application container engine
		docker-ce-cli/bionic,now 5:19.03.4~3-0~ubuntu-bionic amd64 [installed,automatic]
		Docker CLI: the open-source application container engine
	root@uduntu:~#

OK这就搞定了!

好啦这次就到这里了，我继续更新我的大脑啦！！！