Since early 2016, PCF has been using Xubuntu for all of our computers. Xubuntu is a Debian/Ubuntu based operating system that is bosh fast and user friendly. We are using version 16.0.4 which is supported until April of 2019.
If you are interested, the full user documentation for version 16.0.4 is located here:
https://docs.xubuntu.org/1604/user/C/index.html