Install kde-window-manager by entering the following commands in the terminal:
sudo apt update sudo apt install kde-window-manager
Description:
transitional package for kwin-x11
This transitional package allows one to migrate to the packages providing the X11 version of the KDE window manager. . It can be safely removed after the installation.
Homepage: https://projects.kde.org/projects/kde/workspace/kwin
Version: 4:5.12.4-0ubuntu2
Section: universe/oldlibs