The instructions for Ubuntu work for the most part on Debian installations. The main difference is that Debian does not use Upstart by default, Debian 8 (Jessie) uses Systemd, pre-Jessie Debians use SysV init. This guides shows you how to install Mattermost on Debian under /opt and running as system user named mattermost. It also supplies an init script to be installed in /etc/init.d. If you are using Systemd this will get turned into a Systemd service file at boot-time, otherwise it will just work.
