GDM is the Gnome Display Manager, responsible for launching an X session, as well as displaying the login screen for the user.

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How do I prevent GDM from running at boot on Ubuntu?

I have a Ubuntu (Hardy Heron) sever that currenlty boots up and runs gnome. I would like to make it so that when it boots it only goes into text-mode (e.g. the x server never starts) I tried: sudo ...
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Ubuntu Login Screen Reloads

I am trying to login to my Ubuntu desktop after updating a bunch of packages and rebooting. I know I am authenticating successfully but what seems to happen is that after I enter my username and ...
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Ubuntu lost GNOME installation, cyclic dependencies when reinstalling GNOME

Take a look here first. After solving that problem, I noticed that KDM won't let me select GNOME session. I just have KDE and xterm. I reinstalled GDM and switched to it, but I still can't start ...