【求助】关于虚拟机中ubuntu的安装增强功能

在virtualbox 虚拟机中安装了ubuntu，之后想 安装增强工具包
sh autorun.sh
便出现以下内容：
Verifying archive integrity... All good.
Uncompressing VirtualBox 3.2.6 Guest Additions for Linux........
VirtualBox Guest Additions installer
Removing installed version 3.2.6 of VirtualBox Guest Additions...
Building the VirtualBox Guest Additions kernel modules
Building the main Guest Additions module ...fail.

Installing the Window System drivers
Warning: unknown version of the X Window System installed.  Not installing
X Window System drivers.
我是菜鸟，刚接触linux，请问应该怎么解决问题？
非常谢谢！！

帮顶

这应该是说x不对
不过virtualbox增强包好像不需要x吧?
我在virtualbox 里装的sl, 就没有x, 但是增强包也可以装上去