Soon after it entered Feature Freeze development stage on August 24, 2017, the upcoming Ubuntu 17.10 (Artful Aardvark) operating system is yet to receive a polished and final default desktop session which resembles that of previous releases running Unity.
As you are aware, Ubuntu 17.10 is launching next month with the latest GNOME desktop environment by default, as Canonical decided to drop development of the Unity user interface, which was built by them on top of the GNOME Stack. Therefore, they put together a “Fit & Finish Hackfest” event to fix some theming issues.
Last month, Canonical’s Will Cooke said in a weekly report that the Ubuntu Desktop team is working hard to set up the default Ubuntu GNOME Shell session to be capable of co-existing with the standard, vanilla GNOME Shell session that can be added by users at any moment after installing the operating system.