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VirtualBox/Installation

http://gengwg.blogspot.com/

There are two versions of VirtualBox available, one packaged by Ubuntu, one by VirtualBox. Both are Open Source (http://www.virtualbox.org/wiki/Editions).
There are a few extra features, such as USB support, which are closed-source and distributed in separate extension packs.
Installing VirtualBox from Ubuntu repositories (historically called VirtualBox-OSE for Open Source Edition) is easiest. Search for virtualbox-ose package in synaptic, aptitude or whichever package manager you use, or use this link.
To add the oracle maintained repository and install VirtualBox, copy paste this command into a terminal: 
sudo sh -c "echo 'deb http://download.virtualbox.org/virtualbox/debian '$(lsb_release -cs)' contrib non-free' > /etc/apt/sources.list.d/virtualbox.list" && wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add - && sudo apt-get update && sudo apt-get install virtualbox-4.3 dkms
The latest version at the time of writing was 4.3. If VirtualBox has come out in a newer version than 4.3, you should update the package name in the command to reflect that.
Instructions are compiled from information from: http://www.virtualbox.org/wiki/Linux_Downloads
See VirtualBox/Previous for information on detailed instructions for older versions of Ubuntu and Virtualbox. 


64 bit guests

A 64 bit host CPU is not enough to run 64 bit guests (in contrast to VMWare). The host must also be running a 64-bit OS and have hardware virtualization extensions enabled in the mainboard BIOS.
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