Installing VM-Virtual Box

Install virtualbox 4.x on ubuntu 11.04
 

You need to edit /etc/apt/sources.list

gksudo gedit /etc/apt/sources.list

Add the following line

deb http://download.virtualbox.org/virtualbox/debian natty contrib

Save and exit the file

wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -

Update source list

sudo apt-get update

Install virtualbox

sudo apt-get install virtualbox-4.0

Note: Ubuntu/Debian users might want to install the dkms package to ensure that the VirtualBox host kernel modules (vboxdrv, vboxnetflt and vboxnetadp) are properly updated if the linux kernel version changes during the next apt-get upgrade. For Debian it is available in Lenny backports and in the normal repository for Squeeze and later. The dkms package can be installed through the Synaptic Package manager or through the following command:

sudo apt-get install dkms

Install virtualbox 4.x on Windows 

 

The VirtualBox installation can be started

• either by double-clicking on its executable file (contains both 32- and 64-bit architectures)
• or by entering
  

  VirtualBox.exe -extract

  on the command line. This will extract both installers into a temporary directory in which you'll then find the usual .MSI files. Then you can do a
  

  msiexec /i VirtualBox--MultiArch_.msi

  to perform the installation.