Ubuntu16.04更換國內鏡像源(親測有效)

1.備份源

備份以前的源，預防萬一。

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

2.更換源

使用gedit打開存放鏡像源的文檔

sudo gedit /etc/apt/sources.list

注意：將原來的內容全部刪掉不用擔心會出問題，因爲我們已經備份了。
複製下面的內容，粘貼到打開的文檔並保存

deb http://mirrors.aliyun.com/ubuntu/ xenial main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main

deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main

deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates universe

deb http://mirrors.aliyun.com/ubuntu/ xenial-security main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security universe

3.更新源

sudo apt-get update
sudo apt-get -f install
sudo apt-get upgrade

4.完成

參考文章：Ubuntu16.04更換國內的源