注：kubuntu中凡sudo gedit一律改为sudo kedit 或是sudo kate
1.修改源
sudoedit /etc/apt/sources.list
将内容替换为以下之一

#传说中的中国科技大学
deb ftp://debian.ustc.edu.cn/ubuntu dapper main restricted universe multiverse
deb ftp://debian.ustc.edu.cn/ubuntu dapper-security main restricted universe multiverse
deb ftp://debian.ustc.edu.cn/ubuntu dapper-updates main restricted universe multiverse
deb ftp://debian.ustc.edu.cn/ubuntu dapper-backports main restricted universe multiverse
deb ftp://debian.ustc.edu.cn/ubuntu dapper-proposed main restricted universe multiverse

#传说中的北京交通大学
deb http://mirror.bjtu.edu.cn/ubuntu/ dapper main restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ dapper-updates main restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ dapper-security main restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ dapper-backports main restricted universe multiverse

#真正能用的清华大学的源
deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ dapper main restricted universe multiverse
deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ dapper-security main restricted universe multiverse
deb ftp://ftp3.tsinghua.edu.cn/mirror/ubuntu/ubuntu/ dapper-updates main restricted universe multiverse

#传说中的上海交通大学，听说现在硬盘挂了，曾经最热门的源之一
deb http://ftp.sjtu.edu.cn/ubuntu/ dapper main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ dapper-backports main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ dapper-proposed main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ dapper-security main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ dapper-updates main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ dapper main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ dapper-backports main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ dapper-proposed main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ dapper-security main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ dapper-updates main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu-cn/ dapper main multiverse restricted universe

#传说中的兰州大学
deb ftp://mirror.lzu.edu.cn/ubuntu/ dapper main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ dapper-backports main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ dapper-proposed main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ dapper-security main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ dapper-updates main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu-cn/ dapper main multiverse restricted universe




deb http://ubuntu.cn99.com/ubuntu/ dapper main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ dapper-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ dapper-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ dapper-backports main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu-cn/ dapper main restricted universe multiverse


deb http://archive.ubuntu.com/ubuntu/ dapper main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ dapper-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ dapper-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu-cn/ dapper main restricted universe multiverse



deb http://mirror.lupaworld.com/ubuntu/archive/ dapper main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ dapper-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ dapper-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ dapper-backports main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/ubuntu-cn/ dapper main restricted universe multiverse


保存编辑好的文件

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