Linux Find If Processor (CPU) is 64 bit / 32 bit [long mode ~ lm] - nixCraft
How To fix “This kernel requires an x86-64 CPU, but only detected an i686 CPU. This processor is unsupported in RHEL 7.” when booting from VirtualBox - Tech Antidote
Watch: How to Solve this kernel Requires an x86-64 CPU, but Only Detected an i686 CPU - YouTube