Ubuntu 16.04 LTS国内快速更新源

一、源文件位置

备份并替换/etc/apt/sources.list的源内容：

二、更改源文件内容

sudo vi /etc/apt/sources.list

deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse

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

deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse