Ubuntu Unity 24.04 continues to use Unity 7.7, which has undergone maintenance. Our primary focus for this release has been to have a working Lomiri variant in collaboration with the UBports Foundation, to serve as an alternative to Unity7 since we’re stuck with X11 for the time-being. This requirement arises from certain dependencies, including Nux, the UI toolkit used for rendering Unity7’s user interfaces. UnityX too uses Nux unfortunately (since it’s a fork of the Unity7 codebase), and so while it can be made to run under stacking Wayland compositors like Wayfire and labwc, it’d continue to rely on X (Xwayland in this case), and so would only act as a stop-gap. Getting around this would mean an entire rewrite, and so while Unity7 isn’t going away anytime soon, Lomiri would act as a suitable replacement if there ever arose a need.

Ubuntu Unity is a Linux distribution based on Ubuntu, using the Unity interface in place of Ubuntu's GNOME Shell. The first release was 20.04 LTS on 7 May 2020. Prior to the initial release it had the working names of Unubuntu and Ubuntu Unity Remix.

History
The Unity interface was originally developed by Canonical and first included as the default interface in Ubuntu 11.04, which was released in April 2011. Unity was developed as an alternative to the GNOME Shell, which replaced the GNOME 2 interface. At that time, Canonical had planned to converge the desktop, cellphone and tablet interfaces into Unity 8, a project that was abandoned in 2017 when Ubuntu moved to the GNOME 3 desktop instead, ending Unity development at version 7, version 8 being incomplete. Ubuntu 17.10 introduced the GNOME 3 desktop in October 2017, but it was not universally accepted by Ubuntu users or developers. A number of forks were proposed, with UBports taking over Unity 8 development for its value as a cellphone interface and renaming it Lomiri in February 2020. In 2019 Canonical gave its approval for the use of trademarks for a Unity 7 Ubuntu remix.
The first Ubuntu Unity logo

Linux Foundation Certified Developer and Ubuntu team member Rudra B. Saraswat, who is based near Bangalore, India, started Ubuntu Unity. He polled users and used a stock Unity 7 interface with the Ubuntu backend and minimal changes otherwise. He included the Nemo file manager as an alternative to GNOME Files and employed the GNOME Display Manager to replace LightDM X display manager.