Q:

Why can't I install 64 bit Ubuntu on a 64 bit CPU?

I got a Intel G2020 CPU that run Windows 7 64 bit, I want to install 64 bit Ubuntu or Debian in Virtual Box, but while the system boot, it prompts that The kernel require an X86-64 CPU, but only detected an i686 CPU. Unable to boot....
Why can't I install 64 bit Ubuntu on a 64 bit CPU? Is there any difference between a 64-bit i686 CPU and a X86-64 CPU while install a 64 bit kernel?

A:

Just enable the virtualization in BIOS settings, and then delete the original virtual box and new the 64 bit linux, this works for me.

