cinnamon-screensaver software package provides Cinnamon screen saver and locker, 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 cinnamon-screensaver
cinnamon-screensaver is installed in your system.
Make ensure the cinnamon-screensaver package were installed using the commands given below,
$ sudo dpkg-query -l | grep cinnamon-screensaver *
You will get with cinnamon-screensaver package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | X Window System software |
| Package | cinnamon-screensaver |
| Version | 2.8.0-1 |
| Description | Cinnamon screen saver and locker |
| Sub Section | X96 |