Ubuntu Unity is a remix of Ubuntu featuring the Unity7 desktop environment (the default desktop environment used by Ubuntu from 2010-2017).
Unity7 Goodies
This remix comes with the old, loved Unity7 goodies like HUD, Global Menu, so that you can use the features of Unity7 which you had used on the previous versions of Ubuntu before 17.10 Artful Aardvark.
Unity7 Modernized
We have ported Yaru to Unity7, replacing the old ambiance theme, you can just switch to it
by using unity-tweak-tool.
Visit the Ubuntu Unity website here:
https://ubuntuunity.org/