【ubuntu】修改Ubuntu的apt-get为国内镜像源的方法

转至：http://zgljl2012.com/ubuntu-xiu-gai-ubuntude-apt-getyuan-wei-a-li-yun-yuan-de-fang-fa/

1、原文件备份

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

2、编辑源列表文件

sudo vim /etc/apt/sources.list

另外提供一套vim的常用命令https://www.cnblogs.com/cheng88/p/10487870.html 

3、将原来的列表删除，添加如下内容（中科大镜像源）

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  

4、运行sudo apt-get update