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This question already has an answer here:

I am trying to install ubuntu on my desktop.

I used a usb that I had used successfully to my laptop, but it doesn't work for desktop. (12.04 32bit) When I am trying to boot from usb it says that no os detected in usb and only choice is to restart.

I have also burned a dvd with ubuntu 12.10 64bit but when I try to install I get an error: [Errno 5] input/output error

However, I can use the dvd to "try" (and not install) ubuntu.

No I don't have any os in hdd. Before it was dual boot windows 7 and windows 8.

I don't know what to do! Please help!

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marked as duplicate by qbi, Radu Rădeanu, Kevin Bowen, user68186, stephenmyall Jun 6 '13 at 15:46

This question was marked as an exact duplicate of an existing question.

Try re-burning the ISO image on a CD at a lower speed.

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