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I downloaded the Ubuntu 12.04 .iso file from the Ubuntu website. I extracted it and when I am installing it, it shows an error about some file missing and installation stops.

I have tried installing many times and I also downloaded the software once more, but nothing happened differently.

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which installation medium did you use?which software did you use to make bootable cd or usb? –  Avinash Raj Nov 28 '13 at 14:42

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