Both Upstart and CGManager were key components for the next-generation Unity 8 user interface that Canonical built for its mobile and convergence vision. Unfortunately, as you already know, Unity 8 will no longer be developed, nor the Unity 7 interface for that matter, as future Ubuntu releases move to GNOME 3. Previous Ubuntu Linux releases shipped with Upstart and CGManager, but the projects were kept in maintenance mode as they were only used for the Ubuntu Touch mobile OS and the Unity 8 desktop session to provide user session supervisor, as well as to implement application lifecycle.