virtualbox.org

I installed VirtualBox 6.0 on AWS EC2 Ubuntu 18.04 64-bits9X86). After Virtuabox has completely installed on Ubuntu host, running Virtualbox then click on New, when I select under Version, only 32-bits is shown.
Is there best solution for setup 64-bit guests on Ubuntu instance?

64bit VMs require VT-x/AMD-v.

Also, nested VMs are only supported when VirtualBox is both host and guest, performance may be poor on AWS even if you solve the VT-x issue.

FAQ: I have a 64bit host, but can't install 64bit guests.