Dapper (6.06) 版本 sources

• sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
  sudo gedit /etc/apt/sources.list
  

• 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
  

• 保存编辑好的文件

  sudo apt-get update