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I used to dual boot Windows 7 and ubuntu 12.10 on my Dell XPS 15, now I installed Windows 8 Pro and now Ubuntu does not appear during Boot. There was a similar question asked in some other forum and the solution suggested was to boot with the ubuntu CD. I did the same and tried to boot with the CD , I get the error that No Operating system found and Windows 8 loads again.

I will be really grateful if someone can suggest a solution for this.

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up vote 3 down vote accepted

just boot from live usb/disk and reinstall grub

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Thanks it worked, I downloaded the Boot-Repair Disk and burned it onto a usb stick and chose to boot from it and now everything works perfectly – Praveen Gowda I V Nov 12 '12 at 11:47

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