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I am trying to install Ubuntu 12.10 on my old P4 pc it has 1 gb ddr ram and arnd 40 gb free hard disk space. When I boot ubuntu from dvd it says no setup signature found. Please help

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You will need to be more specific. A screen shot might help. –  psusi Nov 28 '12 at 16:14
Is this EFI or BIOS based? EFI computers need to have some "security" turned off to install bootloaders. This question needs a lot more detail. –  coteyr Nov 28 '12 at 17:01
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