调用命令：
sudo gedit /etc/apt/sources.list
在打开的sources.list中，粘贴并保存下面的字符，即可设置完毕。
deb http://debian6.ustc.edu.cn/ubuntu/ maverick main restricted universe multiverse
deb http://debian6.ustc.edu.cn/ubuntu/ maverick-backports restricted universe multiverse
deb http://debian6.ustc.edu.cn/ubuntu/ maverick-proposed main restricted universe multiverse
deb http://debian6.ustc.edu.cn/ubuntu/ maverick-security main restricted universe multiverse
deb http://debian6.ustc.edu.cn/ubuntu/ maverick-updates main restricted universe multiverse
deb-src http://debian6.ustc.edu.cn/ubuntu/ maverick main restricted universe multiverse
deb-src http://debian6.ustc.edu.cn/ubuntu/ maverick-backports main restricted universe multiverse
deb-src http://debian6.ustc.edu.cn/ubuntu/ maverick-proposed main restricted universe multiverse
deb-src http://debian6.ustc.edu.cn/ubuntu/ maverick-security main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ maverick universe multiverse main
deb http://security.ubuntu.com/ubuntu/ maverick-security universe multiverse main
deb http://cn.archive.ubuntu.com/ubuntu/ maverick-updates universe multiverse main
deb-src http://debian.ustc.edu.cn/ubuntu/ maverick-updates main restricted universe multiverse