Ubuntu Unity. As soon as it got mature (some last Ubuntu releases including it) it became the best desktop environment I've ever seen. I was not amazed when the

Ubuntu Unity. As soon as it got mature (some last Ubuntu releases including it) it became the best desktop environment I've ever seen. I was not amazed when they gave up Gnome2 and started Unity (I've moved to XFCE for many years) but learnt to love it later and the move to Gnome3 feels a disaster to me (IMHO Gnome3 is great for tablets but horrible for desktop). Now I've reproduced an environment very similar to Unity with KDE5 and enjoy it but I would certainly love Unity to actually come back.