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I have upgraded to 12.04 a few days ago and it was working just fine yesterday. I just tried to boot Ubuntu now for a couple of tries and it gets to he 5 purple dots and stops. Not sure what to do. It is on a dual boot so I have windows but that is not exactly ideal.

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It might be a corrupted installation. Why not try reinstalling? – harisibrahimkv May 5 '12 at 8:02
How can I reinstall? Do I just remove the partition it is on? – user700786 May 5 '12 at 10:50

Make a bootable USB, boot from it and click on install. During the steps, when it asks for the partition, select the partition you already have Ubuntu installed on. :)

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