VirtualBox is a lifesaver for anyone who wants to tinker and experiment with different operating systems. Using a CD or disc image is easy in VirtualBox, but it's handy to know how to boot from ...

Perhaps they referenced this guide to create a bootable Live USB on Windows, allowing them to test drive something like Ubuntu without making any changes to their PC.

Another even simpler way involves creating a bootable USB flash drive with a fully functional copy of Ubuntu installed.

Jack Wallen walks you through the steps for enabling PXE boot for virtual machines in VirtualBox.