1、首先备份Ubuntu 11.10源列表
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup （备份下当前的源列表，有备无患嘛）
2、修改更新源
sudo gedit /etc/apt/sources.list （打开Ubuntu 11.10源列表文件）
3、将下面的代码粘贴进去（“#”开头的那一行为注释，可以直接复制进文件中）
4、通知ubuntu启用新的更新源   sudo apt-get update
ipv6源
#中国科技大学
deb http://mirrors6.ustc.edu.cn/ubuntu/ oneiric main restricted universe multiverse
deb http://mirrors6.ustc.edu.cn/ubuntu/ oneiric-backports restricted universe multiverse
deb http://mirrors6.ustc.edu.cn/ubuntu/ oneiric-proposed main restricted universe multiverse
deb http://mirrors6.ustc.edu.cn/ubuntu/ oneiric-security main restricted universe multiverse
deb http://mirrors6.ustc.edu.cn/ubuntu/ oneiric-updates main restricted universe multiverse
deb-src http://mirrors6.ustc.edu.cn/ubuntu/ oneiric main restricted universe multiverse
deb-src http://mirrors6.ustc.edu.cn/ubuntu/ oneiric-backports main restricted universe multiverse
deb-src http://mirrors6.ustc.edu.cn/ubuntu/ oneiric-proposed main restricted universe multiverse
deb-src http://mirrors6.ustc.edu.cn/ubuntu/ oneiric-security main restricted universe multiverse
deb-src http://mirrors6.ustc.edu.cn/ubuntu/ oneiric-updates main restricted universe multiverse