How to enable virtual desktops in Ubuntu

Virtual desktops also known as workspaces are disabled by default in current Ubuntu 15.04 release. I will not delve into the reasons why, but simply describe how to turn them on.

Open System settings.

Click Appearance settings.

Select Enable workspaces check-box in Behavior tab.

Use CTRL + ALT + Arrow keys to move between workspaces.

References

What is a workspace, and how will it help me?