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I have never had a problem with Ubuntu until today when I installed 12.04, 64-bit. Everything went fine until I tried to restart after the installation was done.

The screen stays purple with nothing on it. So then I shut it down and put the disc back in and it started up fine.

Why does it all of a sudden need the disc to boot?

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Could you please describe your system in more detail. For example, what graphics card you use, what Ubuntu versions did you try and the like. –  bender Jan 17 '13 at 23:22

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