[64 bit] Booting from USB

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http://ubuntuforums.org – I have an AMD64 motherboard with American Megatrends BIOS but I can't figure out how to get it to boot from USB. I have a USB stick properly configured with an Ubuntu ISO (at least, when I plug it in, it asks if I want to start the Update Manager, just like a CD) but when I go into the BIOS, I can't find out where to tell it to boot from USB. How do I determine (from Ubuntu) which version of the BIOS I have? Is there any way to change the configuration of the BIOS from Ubuntu? (Hardware)