Why do Guest Additions need kernel headers in VirtualBox 4.04.?

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http://askubuntu.com – I'm trying to install the Guest Additions in VirtualBox 4.04.on ubuntu 11.10 I have this error: The headers for the current running kernel were not found. If the module compilation fails then this could be the reason. Note that I have already installed the headers but still get this error. Do you have you an ideas please? (HowTos)