Install unity-services by entering the following commands in the terminal:
sudo apt update sudo apt install unity-services
Description:
Services for the Unity interface
Unity is a desktop experience that sings. Designed by Canonical and the Ayatana community, Unity is all about the combination of familiarity and the future. We bring together visual design, analysis of user experience testing, modern graphics technologies and a deep understanding of the free software landscape to produce what we hope will be the lightest, most elegant and most delightful way to use your PC. . This package contains the D-Bus service used for unity.
Homepage: https://launchpad.net/unity
Version: 7.5.0+18.04.20180413-0ubuntu1
Section: universe/gnome