I have seen this version of GNOME desktop and want to install it on my computer:
I saw it on a YouTube video and it looks great. It looks like it is the OpenSUSE or Fedora GNOME desktop.
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What you see in the screenshot is regular Gnome desktop. It shows that particular view when you open Activities menu - the Gnome's equivalent of Unity dash or Start Menu in windows.
To get it, just run
sudo apt-get install gnome-shell. If you want full blown Ubuntu Gnome just like official installation, then run
sudo apt-get install ubuntu-gnome-desktop