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I have a Dell Inspiron 3521 laptop, Core i3 with 4GB RAM, and a 500 GB hard drive.

I tried to install Ubuntu 13.04 from a USB, alongside Windows 7. Everything went fine and it said restart now to finish. I restarted the laptop and only Windows shows up,and more than 100 GB of the HDD is gone. Please can someone help me get Ubuntu booting?

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Did you install the bootloader during instillation? – DaboRoss Jun 12 '13 at 21:11
@DaboRoss How can you not install a bootloader? – Alvar Jun 12 '13 at 21:34
@Alvar I might be confusing with the other distros, but I am pretty sure there is an option to install without overriding the bootloader – DaboRoss Jun 12 '13 at 22:58

Boot-Repair might help you.Take ubuntu live cd and install boot-repair it fixes most dual boot problems.

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