Can anyone tell me how to change Unity to the GNOME interface in the photo?

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http://askubuntu.com – My simple goal is to get a similar desktop environment that the one you can see in the screenshot: My laptop has an i3 CPU and an ATI HD 5650 graphic card and it is up for the task, but anytime I am trying the installation, I get a weird interface. What do I have to do after I have installed 12.04 64-bit version to get to the same interface (GNOME) that you have just seen in the above screen-shot? (HowTos)