As a person who uses Linux regularly, often I am asked about my opinions about other operating systems, especially those coming from large companies located in Redmond, Washington. Here's the deal.

Virtual machines can seem juuuuust a bit too geeky for most otherwise computer-friendly people. That's sad, because it's an easy, free way to try another operating system, or use those one or two apps ...

Oracle VM VirtualBox is the most advanced free desktop-based virtualization utility and the most advanced open-source version virtualization software, too. It's not the best or easiest to use ...

It is the first thing you need to fix the issue as stated above. For that, you need to run the virtual machine showing the error and go to the Devices > Install Guest ...