I have an old computer (from 2012) with lots of RAM, which works fine. I bought it with a Windows 8 license, which has since been upgraded to Windows 10. In the last couple of years it went for too many infinite restart loops while updating Windows 10. It cost money to get Windows reinstalled.
After this last infinite restart loop, I decided to install Ubuntu 16.04, and on a brand new hard disk but in the same old machine. Now I would like to run VirtualBox and a Windows 10 virtual machine on this Ubuntu machine. How can I go about doing this?
I don't have the OS installation media separately.