ubuntu命令行更换软件源

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软件源的地址配置地址在/etc/apt/sources.list
1. 先备份之前的配置文件

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

1. 修改配置文件

   sudo vim /etc/apt/sources.list

2. 修改内容如下
   新手不会修改，可以参照以下步骤
   按i进入插入模式，将之前的源删掉，注意这个文件夹中#是注释,复制以下内容粘贴，之后按Esc，之后按:进入命令模式，wq退出并保存

deb http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse

1. 更新
   sudo apt-get update