When I click on Ubuntu after the dual boot screen I get just a purple screen and nothing happens.
closed as too localized by Eliah Kagan, con-f-use, Jorge Castro, Call me V, jokerdino♦ Aug 30 '12 at 1:16
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Well, that purple screen appears when I start my Ubuntu computer... when it is loading.
Probably if you wait some time Ubuntu will start up normally. If not, probably something got wrong with your installation. Then you will have to reinstall Ubuntu...