I already clicked "Try Ubuntu" on Ubuntu 13.04 because there's no full installation button. I dont know why ?
But after restart , It's just skipped to windows boot .
What should I do ?
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Well, "Try Ubuntu" does what it suggest, you can try Ubuntu with it, without installing, of course after restart you will get to your old system.
You can install it by clicking the Install icon on the desktop of the Live system.