When you try to install the VirtualBox Guest Additions for a Linux guest system, this will fail due to some weired ‘features’ in the installation. This post is based on my experience with VirtualBox 3.0.6.
To perform the installation do the following:
Choose Install Guest Additions... from the VirtualBox menu. Open a terminal window in your guest system. Do a
cd /media/VBOXADDITIONS_3.0.6_52128/
(the foldername will change depending on the VBox version). Proceed as described below.
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