virtualbox 4.08安装虚机Ubuntu11.04增强功能失败解决方法

在笔记本安装Ubuntu11.04增强功能失败
[quote]
fuliang@fuliang-VirtualBox:~$ sudo /etc/init.d/vboxadd setup
Removing existing VirtualBox DKMS kernel modules ...done.
Removing existing VirtualBox non-DKMS kernel modules ...done.
Building the VirtualBox Guest Additions kernel modules
The headers for the current running kernel were not found. If the following
module compilation fails then this could be the reason.

Building the main Guest Additions module ...done.
Building the shared folder support module ...done.
Building the OpenGL support module ...done.
Doing non-kernel setup of the Guest Additions ...done.
You should restart your guest to make sure the new modules are actually used
[/quote]
在Building VirtualBox Guest Additions kernel modules的时候，缺少kernal的头文件，
使用下面的命令安装：
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sudo apt-get install dkms build-essential linux-headers-$(uname -r)
[/quote]
其实build-essential linux-headers已经是最新的了，只是缺少dkms(Dynamic Kernel Module Support),当有新的kernal安装的时候，它能让kernal的设备驱动自动的重新构建。
详情见:[url]http://en.wikipedia.org/wiki/Dynamic_Kernel_Module_Support[/url]
之后再
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sudo /etc/init.d/vboxadd setup
[/quote]
成功：
[quote]
Removing existing VirtualBox DKMS kernel modules ...done.
Removing existing VirtualBox non-DKMS kernel modules ...done.
Building the VirtualBox Guest Additions kernel modules ...done.
Doing non-kernel setup of the Guest Additions ...done.
You should restart your guest to make sure the new modules are actually used
[/quote]