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I have installed Ubuntu 12.04 alongside Windows 8 on my Sony Vaio SVF15218SN laptop, but I am unable to boot Ubuntu. I disabled the Secure Boot option. Please suggest some solutions.

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Please give more information. What did you try, what went wrong? Walk us through step by step. – Piccolo Aug 22 '13 at 6:06

Try to look at the following Official link to Dual boot Ubuntu with Windows Operating system.

Dual boot Ubuntu with Windows

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It is a bit troublesome to install Ubuntu after Installing Windows 8 , Because of UEFI .

Link for Pre Installed 8 , Other Link I advise you to Install Ubuntu then 8 Link

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