前面我们在安装Ubuntu18.04系统时就遇到一个配置软件源的选项，系统默认软件源来自Ubuntu官方。但是官方软件源在国内使用并不理想，不仅 速非常慢而且容易出现超时的现象。所以一般我们都会选择更换国内镜像源来安装软件（比如阿里、 易、清华、中科大等都提供了不错的镜像源），我们只要选择一个适合自己地区的镜像源进行更换就可以大幅度的提升软件下载速度了。
?备份Ubuntu官方源文件
养成好习惯在更改配置之前最好先做个备份，万一出现问题还可以恢复哦！然后再窗口中执行以下命名：
cd /etc/apt // 进入到apt目录sudo cp sources.list sources.list.back // 复制sources.list文件? 修改sources.list文件
?更新软件源
修改并保存好sources.list文件后我们就可以来试试更新软件源了，使用 sudo apt-get update 命令即可更新获取清华软件源提供的软件列表。
?更新软件
软件源更新好了我们就可以尝试下更新软件了，执行命令：sudo apt-get upgrade即可更新已安装软件。
?知识拓展：vim 使用
vim 分为三种模式，分别是命令模式、输入模式、底线命令模式。当启动vim时进入命令模式，该模式只有一些最基本的命令。比如你要进入输入模式可以输入i、删除当前行可以输入dd、切换底线模式可以输入符 ：等。进入输入模式之后可以才可正常输入内容，退出则按ESC键即可切换回命令模式。进入底线模式时可以对文件进行操作，比如wq为保存并退出文件。
?其他软件源
还有很多不错的国内源可以使用，这里为大家收集了些常用的国内源。大家可以根据自己的需求选择适合自己的软件源进行更换，更换之后记得更新软件源！
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