kde-window-manager software package provides K window manager (KWin), you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install kde-window-manager
kde-window-manager is installed in your system.
Make ensure the kde-window-manager package were installed using the commands given below,
$ sudo dpkg-query -l | grep kde-window-manager *
You will get with kde-window-manager package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | X Window System software |
| Package | kde-window-manager |
| Version | 4:4.11.11-0ubuntu0.2 [amd64, i |
| Description | K window manager (KWin) |
| Sub Section | x11 |