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I have downloaded ubuntu 64 bit version iso on my mobile then transfered it to laptop via bluetooth. Now when i tried to install it my preparing a usb bootable device with windows installer, it is shows could not retieve the required disk image file and then the installation fails. What should i do.

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You might have a corrupted ISO image. Run an MD5SUM on the ISO image. Why can't you download directly to your laptop? –  Mitch Nov 24 '13 at 5:45

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