在/etc/apt/sources.list加入下面這些源，以前的可以刪除。
deb
http://Ubuntu.cn99.com/ubuntu/ feisty main restricted universe multiverse
deb
http://ubuntu.cn99.com/ubuntu/ feisty-security main restricted universe multiverse
deb
http://ubuntu.cn99.com/ubuntu/ feisty-updates main restricted universe multiverse
deb
http://ubuntu.cn99.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb
http://ubuntu.cn99.com/ubuntu/ feisty-backports main restricted universe multiverse
deb-src
http://ubuntu.cn99.com/ubuntu/ feisty main restricted universe multiverse
deb-src
http://ubuntu.cn99.com/ubuntu/ feisty-security main restricted universe multiverse
deb-src
http://ubuntu.cn99.com/ubuntu/ feisty-updates main restricted universe multiverse
deb-src
http://ubuntu.cn99.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb-src
http://ubuntu.cn99.com/ubuntu/ feisty-backports main restricted universe multiverse
deb
http://ubuntu.cn99.com/ubuntu-cn/ feisty main multiverse restricted universe
