cleancss software package provides Tool for minifying CSS files, you can install in your Ubuntu 16.10 (Yakkety Yak) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install cleancss
cleancss is installed in your system.
Make ensure the cleancss package were installed using the commands given below,
$ sudo dpkg-query -l | grep cleancss *
You will get with cleancss package name, version, architecture and description in a table
| Distro | Ubuntu 16 10 yakkety yak |
| Section | Web Software |
| Package | cleancss |
| Version | 1.0.12-2 |
| Description | Tool for minifying CSS files |
| Sub Section | web |