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用以下内容替换文件中的所有内容

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

这里你也可以直接使用更快速的ubuntu.cn99.com的源（推荐）:
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

这里你还可以使用速度也非常快的的mirror.lupaworld.com的源:
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

如果是教育网用户推荐使用上海交通大学的源:
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 http://ftp.sjtu.edu.cn/ubuntu-cn/ dapper bleeding main multiverse restricted universe

教育网用户也推荐使用清华大学计算机系学生科协的源:
deb http://mirror.net9.org/ubuntu/ dapper main multiverse restricted universe
deb http://mirror.net9.org/ubuntu/ dapper-backports main multiverse restricted universe
deb http://mirror.net9.org/ubuntu/ dapper-proposed main multiverse restricted universe
deb http://mirror.net9.org/ubuntu/ dapper-security main multiverse restricted universe
deb http://mirror.net9.org/ubuntu/ dapper-updates main multiverse restricted universe
deb http://mirror.net9.org/ubuntu-cn/ dapper main multiverse restricted universe