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How to quickly install Virtualbox 4.0 in Ubuntu

Want to easily upgrade to the latest version of virtual machine application ‘Virtualbox’?

You now can using the following small script by Gnome-look user NikolaiRach1.

VirtualBox 4.0 was released just before Christmas and brings with it many changes worthy of upgrading for: a new GUI, ‘extensions’ support, scale display mode, more virtual hardware, and a slew of  fixes and enhancements to existing features.

The script is simple in purpose: it adds the official Oracle Virtualbox repository, updates and then installs Virtualbox 4.0. No .debs, .tar.gz, no hassle.

How to upgrade/install VirtualBox 4 in Ubuntu