I have installed Windows7 as guest in my Ubuntu 11.10 host using virtualBox.

Now the problem is when I try to install the VirtualBox Guest Additions I am getting the following error.

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    Which version of VBox? And the Oracle one, or the OSE? For the latter you need to install the package virtualbox-guest-additions-iso. – enzotib Dec 27 '11 at 19:40
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    Virtual Box has quite a lot of useful updates that increase performance and stability (at the moment version 4.1.8). Therefore I recommend you install it directly from the Oracle repository, where you can get both the Open Source version and additional closed source (PUEL) extensions for USB2.0, RDP, and PXE boot support. This will always include most recent Guest Additions as well. – Takkat Dec 27 '11 at 20:32

You could install Guest Additions from terminal, using this command:

 sudo apt-get install virtualbox-guest-dkms
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I got this same error and then realized that I needed to explicitly tell Ubuntu Software Center to install virtualbox-guest-additions-iso.

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