Yeah, Ubuntu GNOME is deprecated. No further development is being made towards that particular flavor, thus I’m calling in inactive. If ya’ll want to split hairs, knock yourself out, but either way you cut it, it’s not a thing. Here’s some evidence:
- The team announced they’d be joining the Ubuntu Desktop team.
- The development team on Launchpad is gone.
- The #ubuntu-gnome IRC channel is unregistered.
Twitter and Facebook and Google Plus and Slack are inactive, which leaves the mailing list as the only real support option out of all the listed options.
tl;dr there are no people really working on the “Ubuntu GNOME” flavor and it’s questionable how well “supported” it is for Xenial.
And while you’re being pedantic, don’t forget Mythbuntu and Edubuntu are in the same boat. The former provides 3 year support and their last release was Xenial, while the latter provides 5 year support and their last release was Trusty.