1. update your apt source.list
    `修改源并升级更新</p>

*

不同的网络状况连接以下源的速度不同, 所以cn99并不一定是最快的源, 建议在添加前手动验证以下源的连接速度(ping下就行),比如说北京网通ADSL用户连接cn99就非常慢,而ftp.sjtu.edu.cn是相对较快的源,选择最快的源可大大节省下载时间

`` 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://archive.ubuntu.org.cn/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: `
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(推荐): ` 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` 如果是教育网用户请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 main multiverse restricted universe
` 或者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
sudo apt-get dist-upgrade(optional)` 2. 配置好UBUNTU的APT源之后,建议马上加上中文输入法,推荐用fcitx! `sudo apt-get install fcitx im-switch
im-switch -s fcitx
` 3. 加上播放器,听歌!