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The extension pack is needed in order to have USB 2.0, RDP and PXE boot support and is _not_ part of the free version, so please read their conditions before using it: https://www.virtualbox.org/wiki/VirtualBox_PUEL Further information and details about the extension pack is available here: https://www.virtualbox.org/manual/ch01.html#intro-installing I'm wimping out here and use requireFile to ask the user to fetch the extension pack manually, simply because I'm not a lawyer. I've seen other distributions that fetch the extension packs directly from upstream, but I'm not sure if that is according to Oracle's PUEL. Signed-off-by: aszlig <aszlig@redmoonstudios.org>