apt-get update error : It seems that the xenial distribution does not exits?

Hello, Im trying to install v2012 on a Ubuntu 16.04 but when I do apt-get update I get:

Err :11 https://dl.openfoam.com/repos/deb xenial/main amd64 Packages 404 Not Found

E: Impossible de récupérer https://dl.openfoam.com/repos/deb/dists/xenial/main/binary-amd64/Packages 404 Not Found

then offcourse if i do sudo apt-get install openfoam2012-default i get

Lecture des listes de paquets... Fait

Construction de l'arbre des dépendances

Lecture des informations d'état... Fait

E: Impossible de trouver le paquet openfoam2012-default

Am I missing something The xenial distribution seems not to exits

Thank you in advance