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Windows is screwed up and I cannot register it on my computer (product on HD doesn't match product previously on motherboard). So I decided to just run Ubuntu instead. I put the Ubuntu .iso file I downloaded off this site on a USB and tried to boot it from there but is gave me a disc error and never showed Ubuntu as an option.

I must be doing something wrong. It probably isn't as simple as Im hoping

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check USB is bootable or not. if not then follows this step to make USB bootable .

Afterwards you can boot from the USB as if you booted from a CD and proceed to install Ubuntu on your hard disk.

more information visit here

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