1.备份源列表
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
2.找到对应版本的源，可以在以下界面当中找到，主要版本要对。http://wiki.ubuntu.org.cn/%E6%BA%90%E5%88%97%E8%A1%A8。
当前我的是12.04版本，使用163的源，所以源列表如下。
deb http://mirrors.163.com/ubuntu/ precise main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ precise-security main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ precise-updates main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ precise-proposed main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise-security main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise-updates main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise-proposed main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse
3.编辑sourcelist
执行以下命令编辑sources.list文件，清空里面的内容，拷贝第二步得到的地址到这个文件当中去。
sudo vim /etc/apt/sources.list
4.刷新数据列表
sudo apt-get update
本地源的配置方式：
可以参考以下文章：
http://wenku.baidu.com/view/20a88e8ba0116c175f0e487d.html
http://blog.sina.com.cn/s/blog_7cb52fa80101csx5.html