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after installing Ubuntu 13.04 alongside with windows 7,my laptop restarted but entered to windows 7 without letting me choose between 7 & Ubuntu !!

my laptop (Lenovo G580)

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marked as duplicate by Thomas Ward, Eliah Kagan, Radu Rădeanu, Alaa Ali, guntbert Sep 3 '13 at 10:45

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Did you (re)install Windows after installing Linux?

You have to repair the grub boot-loader (or replace it with another boor loader). Repair-Boot seems to be the best option.

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I cant enter to ubuntu !! – user189566 Sep 2 '13 at 20:46
@user189566 you don't need to be able to boot into Ubutnu to use boot repair. All you need to do is boot from your liveDVD/USB click "Try Ubuntu" and then follow the direction on installing and using boot repair. The steps for using the liveDVD are option 2 on the webpage that was linked. – TrailRider Sep 2 '13 at 21:31

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