Hi. I have a dell precision 5520. I need to install Ubuntu 16.04 (64-bit) via Virtualbox. However, Virtual box is not showing 64 bit version of any operating system, it is only showing 32 bit version of Ubuntu.

I enable all the virtualization-related settings in the BIOS and uninstall Hyper-V, and then uninstalled and reinstalled Virtualbox. After making those changes, problem still continues.

Would you please help me?

Thank you.