How To Install VirtualBox 4.0 Beta In Ubuntu

VirtualBox 4.0 beta comes with a redesigned user interface, settings/disk file layout for VM portability, support for more than 1.5/2 GB guest RAM on 32-bit hosts, support for the Intel ICH9 chipset, support for limiting a VM's CPU time and IO bandwidth, asynchronous I/O for iSCSI, VMDK, VHD and Parallels images, support for resizing VDI and VHD images and more.