Virtualbox installation problems

[waterfietser]

I am trying to instal VirtualBox 1.4.0 as downoaded from www.virtualbox.org

But after

Code:

sudo sh VirtualBox_1.4.0_Linux_x86.run install

I get the follwoing:

Verifying archive integrity... All good.
Uncompressing VirtualBox for Linux installation........
VirtualBox Version 1.4.0 (Wed Jun  6 00:03:39 CEST 2007) installation
Please install the build and header files for your current Linux kernel.
The current kernel version is 2.6.18.8-86
Problems were found which would prevent VirtualBox from installing.
Please correct these problems and try again.

Probably I have to install something. On the dutch forum Willem told me to install the kernel-headers package, but it's already installed.

Does anybody know what to do?

Joost

[Kavani]

Open the package manager and install the kernel-source, if you haven't already.  Let us know, if it works!

[waterfietser]

That did it.

Thanks!

[Kavani]

Wonderful!  Have fun!