The Open Source Edition in the repository is very limited, most probably it do not support shared folder, USB devices. To make these things work you need to download the version in the Website, which is not open source but free.
Download <http://www.virtualbox.org/wiki/Linux_Downloads> Mahmood Software Engineer ReliSource Ltd. -- ubuntu-bd mailing list ubuntu-bd@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bd
