北交ubuntu更新源
13.04版本名称为raring
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick main restricted
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick-updates main restricted
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick universe
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick-updates universe
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick multiverse
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick-updates multiverse
deb http://archive.canonical.com/ubuntu maverick partner
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick-updates main restricted
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick universe
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick-updates universe
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick multiverse
deb http://mirror6.bjtu.edu.cn/ubuntu/ maverick-updates multiverse
deb http://archive.canonical.com/ubuntu maverick partner
输入以下命令后 在编辑器里吧maverick换成raring就可以了
sudo vim /etc/apt/sources.list