轉至：http://zgljl2012.com/ubuntu-xiu-gai-ubuntude-apt-getyuan-wei-a-li-yun-yuan-de-fang-fa/
1、原文件備份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2、編輯源列表文件
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、將原來的列表刪除，添加如下內容（中科大鏡像源）
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、運行sudo apt-get update