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I was using Ubuntu 13.10 and Ubuntu Studio 13.10 along with windows 7,and then I installed windows 8.1 in place of the Windows 7. Now the PC(Toshiba Satellite L855) directly boot into windows 8.1 with out giving me the grub choice menu. I can't access both Ubuntu as well as Ubuntu Studio OS.

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I think the easiest option for you is to click this link and try out Boot Repair to detect and write a new Grub bootloader which will let you boot into ubuntu and windows again...

Boot Repair

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Hay I couldn't boot the Boot keeps saying no os found – user254241 Mar 4 '14 at 11:34
Try the 2nd option from the link, boot using the Ubuntu CD or Flash Drive you used to install with, then install boot repair on the live session and use from there... – TenPlus1 Mar 5 '14 at 8:02
Thank u very much it works just fine! – user254241 Mar 6 '14 at 11:09

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