Traditionally, X configuration was a common, major problem; grown men have been known to weep over it. Such problems are largely a thing of the past, and in almost all cases you will find that the configuration that occurs automatically during the installation gives you a good working setup.
The most likely reason why X configuration might fail these days is that you are using a very new graphics adapter that is not natively supported by XFree86 or X.org. Fortunately, even in this case there is usually a workaround, which is to use framebuffer graphics (see the section on this topic later in the chapter).
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