Ubuntu Guide shows you how to change the number of workspaves in Ubuntu 12.04

Workspaces refer to the grouping of windows on your desktop. These virtual desktops increase the size of your working area. Workspaces are meant to reduce clutter and make the desktop easier to navigate. This simple tutorial shows how to change the number of workspaces on Ubuntu Unity.

  Change the Number of Workspaces in Ubuntu 12.04 Precise