进入你的系统.修自改你的apt源:

# sudo vim /etc/apt/sources.list    //把你原来的源删除.把下面这个源添加到sources.list

deb http://mirror.lupaworld.com/ubuntu intrepid main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu intrepid-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu intrepid-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu intrepid-backports main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu intrepid-proposed main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu intrepid main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu intrepid-security main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu intrepid-updates main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu intrepid-backports main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu intrepid-proposed main restricted universe multiverse