Kernel requires an x86-64 CPU, but only detected an i686 CPU. How can I install Lubuntu/Ubuntu? [duplicate]

Solution : Enable Intel VT-x/AMD-V from BIOS

Source http://hereirestinremorse.wordpress.com/virtualbox/this-kernel-requires-an-x86-64-cpu-but-only-detected-an-i686-cpu-unable-to-boot-please-use-a-kernel-appropriate-for-your-cpu/

If you enable VT-x/AMD-V from BIOS and it still presents this error, try changing your guest settings to Type=Other and Version=Other/Unknown (64-bit).

Download the correct installtion file... you downloaded a 64 bit version but have a 32 bit system.

Get it from here (12.04). Choose PC (Intel x86) desktop CD and not 64-bit PC (AMD64) desktop CD.

14.04 and 16.04.