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I have already activated the AMD Virtualization option in the BIOS, but I continue to see the error. My processor is 64-bit compatible.

PS.: Hi, i want to tell everyone that i found my mistake. I am installing it in Virtual Box and i was selected Ubuntu instead of Ubuntu 64 bit. It seems stupid but this selection is hiiden. Have a nice day.

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What processor do you have? – Mitch Oct 26 '13 at 12:32
To use 64 bit computing you need three things: 1) A CPU capable of 64 bit mode. (Check here). 2) A BIOS allowing you to enable that. 3) an OS using it. -- It sounds as if you have 3, 2 is unsure and 1 can only be answered after you add your CPU model to the post. Most (if not all) modern AMD CPU's do support amd64 though. – Hennes Oct 26 '13 at 12:53

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