[SOLVED] What is GDM? Can I uninstall it if I'm not using gnome?
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GDM is the Gnome Display Manager. That's the element that provides the login dialog.
If you tell us what distro you are using, we can likely tell you how to remove it, but I would advise against doing so unless you have a really tiny hard drive. There's nothing wrong with having multiple window managers/desktop environments installed; if they are not being used, they just lie there harmlessly (Slackware comes with six out of the box). Simply install KDE, log out, and, before you log in, choose KDE in the session manager in the GDM window.
Rather, I'd say that removing Gnome is not worth the effort. Plus, if you leave Gnome in place and find that you want to use a Gnome program for some reason (I sometimes prefer their "Videos," aka totem, video player), you can run it under KDE, since all the required libraries will be present.