Back in April this year, Canonical founder Mark Shuttleworth announced that they'll be replacing Unity (Ubuntu's official desktop interface) with GNOME starting version 18.04 of the Linux distribution. This came as a bad news for those who love Unity.
If you are a hardcore Unity fan, and want to continue using it (Unity 8) with future Ubuntu releases, you'll be glad to know that here, in this article, we'll be sharing a few ways in which you can do that.
Yunit is a project hosted on GitHub. Its description says, "This is a fork of Canonical's Unity 8 repository as of April 5, 2017. Following Mark Shuttleworth's announcement to abandon Unity 8 development, we are planning to continue working with the project."
Here's the project's official website, although it's currently under construction.
Like Yunit, Pure is also a fork of the Unity desktop. It's part of the Artemis project, members of which are also working on CORE, a Plasma-based environment that offers Unity experience. You can access more information about these projects by heading here.
Alternatively, some people have also suggested ways to make GNOME look and feel like Unity - you can check these as well.