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I'm a newbie here and I apologize for posting this question inspite of there being numerous people with the same problem who've posted similar questions. I can't seem to understand what to do.

I'm installing Ubuntu from a bootable USB drive. After pressing F12 while startup and choosing the USB drive, I see the Ubuntu desktop. When I proceed to install Ubuntu it says: "No OS was detected, do you want to erase everything on your drive and install Ubuntu" or "Something Else".

Of course I don't want to erase everything because it'll remove Windows 8 as well. I'm trying to install Ubuntu on the EFI mode. My Windows 8 is installed in the UEFI mode as well.

Please help!

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Welcome to AskUbuntu! This is possibly a duplicate of askubuntu.com/q/306589/58950 and/or askubuntu.com/q/298382/58950 and/or askubuntu.com/q/183765/58950 and/or askubuntu.com/q/265132/58950 and/or askubuntu.com/q/141656/58950... Have you tried the recommendations given there (and other related questions). If so, please report your results with more detail. Otherwise, your question might be closed. –  carnendil Sep 18 '13 at 17:04
    
The "Something Else" option is named very poorly. It's a manual partitioning option, which enables you to resize existing partitions and create new ones manually. Use it, and if you don't understand it, see this question and answer. (For those who want to vote to close this question, that's probably a better reference than any of the ones offered by carnendil.) –  Rod Smith Sep 18 '13 at 17:28
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