Dobivam kod instalacije Ubuntu 12.4 ovu poruku: This kernel requires an x86-64 CPU, but only detected i686. Unable to boot - please use a kernel appropriate for your CPU.
Zanimljivo je da imam 64-bit procesor http://ark.intel.com/products/53446/Intel-Core-i5-2320-Processor-(6M-Cache-up-to-3_30-GHz)