A few days ago Unity 5.0 released along with Unity 2D 5.2 for machines does not support the minimum hardware requirements for Unity. Both of them are available to update on Ubuntu 12.04 Precise Pangolin LTS using local repository. Unity 2D 5.2 brings new functionalities to unity launcher, better performance to the home dash menu and various bug fixes.
Highlights of Unity 2D 5.2 Changelog
Quick List menu using mouse right click on unity launcher icons.
Drag and drop running application to the trash will close the application and also remove it from the launcher in case it’s already pinned.
Right click on dash home icon shows a list of currently available lenses.
Unity panel shows a title “Ubuntu Desktop” when no other application is focused.
Ability to maximize the “Dash Home”. “unmaximize it is not working”.