Ubuntu GNOME is an official flavor of Ubuntu, featuring the GNOME desktop environment.
Ubuntu GNOME (formerly Ubuntu GNOME Remix) is a mostly pure GNOME desktop experience built from the Ubuntu repositories. Our first (unofficial) release was 12.10 (Quantal Quetzal), released in October 2012.
The first official release was 13.04 (Raring Ringtail).
Our final Long Term Support release is Ubuntu GNOME 16.04.5.