Ubuntu 如何更换国内的阿里源

Ubuntu 自带的官方源实在太慢，那么我们如何更换国内的软件源呢，下面提供了更换较快的阿里云国内源的方法：

一、备份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

二、修改
sudo vim /etc/apt/sources.list
将source.list文件内容替换成下面的

deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse*

三、更新

sudo apt-get update