Xubuntu is a light-ish spin of Ubuntu Linux. It uses the Xfce desktop environment and is suitable for older machines which would bog down with a heavier DE like Unity or GNOME or KDE.
Curmudgeonly software reviewer Dedoimedo reports:
Giving a high score to Xubuntu 16.10 Yakkety Yak may look as if it's getting credit only because all other Ubuntu releases this year were horrible, but it is not so. If we exclude the hardware-specific issues with the Realtek drivers--which is a big issue across the entire distro world--and the package manager choice, there weren't any huge, cardinal problems this time. It would seem that Xubuntu is recovering gently. Perhaps it is still too early to tell, but Yak is much, much better than [Xubuntu 16.04 Xenial] Xerus. And it deserves 8/10.
(Score: 4, Informative) by Dr. Manhattan on Tuesday November 08 2016, @01:20PM
This article was about Xubuntu, though. So, no Unity.