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I have tried many methods to install ubuntu 14.04 alongside windows 8.1 but none of the methods worked.

I receive the error message that says "no operating system detected".

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marked as duplicate by Wilf, karel, Eric Carvalho, Radu Rădeanu, Warren Hill Jul 11 at 11:07

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Welcome on Ubuntu. Try to say some words more e.g. if in you system is just installed an operative system (and which one), where did you find methods, in which steps you receive your error... you can edit your post with this link –  Hastur Jul 8 at 22:50