linux里面减号 - 是怎么用啊？

自己在机子上装了ubuntu后下载了macubuntu，然后执行.install.sh出现如下信息


Macbuntu - Mac OS X Transformation Package
The Macbuntu installation script automatically installs and configures
all necessary system components to mimic Mac OS X appearance on Ubuntu Linux

Macbuntu-10.04 v2.0

Includes
* Macbuntu-10.04 theme based on GTK Leopard
* Macbuntu-10.04-Icons based on Mac4Lin_Icons_v1.0
* Macbuntu-10.04-Cursors based on Mac4Lin_Cursors_v1.0
* Mac OS X backgrounds
* Mac OS X fonts

Installations
* Compiz Extras
* Global Menu
* Docky
* Ubuntu-Tweak

Configuration
* Login screen
* Metacity
* Compiz effects
* Window theme
* Backgrounds
* Cursors
* Icons
* Top panel

Checking Ubuntu version...
Failed. System not supported, script will end here
To ignore their compatibility with current OS try ./install.sh force
Exiting...


请问下是什么原因，我的ubuntu是11.10版本，macubuntu是10.04版本，是因为版本的问题吗？如果是那么我现在还能不能装macubuntu

ailed. System not supported, script will end here

To ignore their compatibility with current OS try ./install.sh force

这句英文没什么生僻单词吧…………自己读读就搞定，结果在这等5分钟……