Unity has been replaced with GNOME on Ubuntu 17.04

The latest Ubuntu 17.04 will come with GNOME 3.24 out of the box. Unity 7 will still be available as an addon, however GNOME has been designated for the future.  You can try out the latest Ubuntu here.

via: https://www.theregister.co.uk/2017/04/21/ubuntu_17_04_gnome_not_unity/