After systemd run the gdm service, I understand from Ubuntu Manpage that the
gdm starts an X server and runs a minimal GNOME session including a graphical greeter.
I found a diagram of the GDM’s process flow in GDM Documentation. It shows the Greeter as the starting process of the GDM.
- Am I correct to think the “X server” that is mentioned by Ubuntu Manpage preceeds the “GDM Greeter” that is mentioned in the GDM Documentation and it is not shown in the diagram? Or, does the “X server” process takes place at the “GdmGreeterServer” stage?
Appreciate your help to clarify my understanding. I had previously used Ubuntu’s Unity and am learning my ways around GNOME 3.