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    deb http://mirror.lupaworld.com/Ubuntu feisty main restricted universe multiverse

　　deb http://mirror.lupaworld.com/ubuntu feisty-security main restricted universe multiverse

　　deb http://mirror.lupaworld.com/ubuntu feisty-updates main restricted universe multiverse

　　deb http://mirror.lupaworld.com/ubuntu feisty-backports main restricted universe multiverse

　　deb-src http://mirror.lupaworld.com/ubuntu feisty main restricted universe multiverse

　　deb-src http://mirror.lupaworld.com/ubuntu feisty-security main restricted universe multiverse

　　deb-src http://mirror.lupaworld.com/ubuntu feisty-updates main restricted universe multiverse

　　deb-src http://mirror.lupaworld.com/ubuntu feisty-backports main restricted universe multiverse cn99.com 源 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 然后 sudo apt-get update

　　sudo apt-get dist-upgrade