注：我用的系统是Ubuntu 8.10final版。
1，备份源列表: 终端输入 sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
2，打开源列表: sudo gedit /etc/apt/sources.list,
在弹出的文件里的最后面添加以下源:

deb http://ubuntu.cn99.com/ubuntu/ hardy main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ hardy-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ hardy-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ hardy-proposed main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ hardy-backports main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ hardy main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ hardy-security main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ hardy-updates main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ hardy-proposed main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ hardy-backports main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu-cn/ hardy main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu hardy main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu hardy-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu hardy-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu hardy-backports main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu hardy main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu hardy-security main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu hardy-updates main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu hardy-backports main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ hardy main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ hardy-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ hardy-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ hardy-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ hardy-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ hardy main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ hardy-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ hardy-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ hardy-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ hardy-backports main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu hardy main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu hardy-security main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu hardy-updates main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu hardy-backports main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu hardy-proposed main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu hardy main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu hardy-security main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu hardy-updates main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu hardy-backports main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu hardy-proposed main restricted universe multiverse
deb http://archive.ubuntu.org.cn/ubuntu-cn/ hardy main restricted universe multiverse
填加后保存，退出。
3，更新源列表: sudo apt-get update
4，更新软件: sudo apt-get dist-upgrade
5，安装mplayer，只需要在终端输入：
sudo apt-get install mplayer mplayer-fonts mplayer-skins mozilla-mplayer
6，安装完mplayer默认是支持较少视频格式的，要想像在Windows下那样播放各种类型的视频，就要安装w32codecs。
安装方法：
直接在终端输入 sudo apt-get install w32codecs
这样，就基本安装完成了。

7，不过，我们还是再安装个多媒体解码器，省得以后麻烦：
sudo apt-get install xUbuntu-restricted-extras
8，执行上面7的命令后，会出现下面这个窗口，停在那里不动：
┤ 正在设定 sun-java6-jre ├─────────────────────────┐
│ │
│ Operating System Distributor License for Java v1.1 (DLJ) ↑
│ ▮
│ Operating System Distributor License for Java version 1.1 (DLJ) ▒
│ ▒
│ SUN MICROSYSTEMS, INC. ("SUN") IS WILLING TO LICENSE THE JAVA PLATFORM ▒
│ STANDARD EDITION DEVELOPER KIT ("JDK" - THE "SOFTWARE") TO YOU ONLY UPON ▒
│ THE CONDITION THAT YOU ACCEPT ALL OF THE TERMS CONTAINED IN THIS LICENSE ▒
│ AGREEMENT (THE "AGREEMENT"). PLEASE READ THE AGREEMENT CAREFULLY. BY ▒
│ INSTALLING, USING, OR DISTRIBUTING THIS SOFTWARE, YOU ACCEPT ALL OF THE ▒
│ TERMS OF THE AGREEMENT. ▒
│ ▒
│ 1. DEFINITIONS. "Software" means the code identified above in binary ▒
│ form, any other machine readable materials including, but not ▒
│ limited to, libraries, source files, header files, and data files), ↓
│
│ <OK>
│ │

动又不动了，进又不进。

解决办法 ： 用tab键切换到那个OK(确定)上去. 变红后按回车 OK

9,安装完成了。Mp3，rm，flv等格式的文件均打开了。效果不错。呵呵。

这样就好了。阿弥陀佛 刚从别人那里学来用的，希望对大家有用。阿弥陀佛

谢了。我试试，正在发愁呢！

用后如何？

好帖 我如上过了一遍 顺利成功

看一下wiki上的快速设置指南，相信比你的方法简单，楼主的源加的太多了，这样更新起来会很慢的

我这里的速度还可以。上面填加的那么多更新源，不仅仅是为了现在装Mplayer考虑的。以后装别的，也可能会用得到的。那时候，就不用更新了。直接用命令安装就可以了。新手上路，仅供参考。

=下试试

我正在安装中，这种方法太慢了！