If you need to use virtual machines on Linux, try Virt-Manager. Virt-Manager is more reliable than VirtualBox. Virt-Manager is completely free and open-source. I'm a long-time supporter of VirtualBox.

Constantly testing software and tinkering with a variety of Linux operating systems puts my multiple test-bench computers to constant use. Granted, Linux comes with a lot fewer security risks. But ...

This how-to shows how to use free Ansible software to automate configuration of Cisco routers and links to other Ansible modules that apply to other vendors' gear and support other functionality ...