Sorry but the french Gendarmerie does not run on Ubuntu. They use a custom made distro called GendBuntu which is based on Ubuntu as Ubuntu is based on Debian.
I seriously doubt it's like you say. It's probably a lot more like a "custom made distro" that's based on Ubuntu as Linux Mint is based on Ubuntu: all the core stuff exactly the same, and a few things on top different (namely the DE in the case of Mint).
