创作背景：
之前写过 ubuntu14为例 配置apt-get更新源
https://blog.csdn.net/frdevolcqzyxynjds/article/details/105040267
现在这篇是 ubuntu12.04配置apt-get更新源
下面开始
操作目录
1、先备份好系统自带的源列表
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
2、修改源列表文件
vim /etc/apt/sources.list# 阿里源：
deb http://mirrors.aliyun.com/ubuntu/ precise main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ precise-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ precise-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ precise-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ precise main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ precise-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ precise-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ precise-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ precise-backports main restricted universe multiverse
3、刷新源列表
sudo apt-get update参考链接
http://www.gzidc.com/FrontCms/getHelpArticleShow/cat_id/135/art_id/875.html
