dwm software package provides dynamic window manager, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install dwm
dwm is installed in your system.
Make ensure the dwm package were installed using the commands given below,
$ sudo dpkg-query -l | grep dwm *
You will get with dwm package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | X Window System software |
| Package | dwm |
| Version | 6.0-8 |
| Description | dynamic window manager |
| Sub Section | X154 |