Simply run these two commands:

sudo add-apt-repository multiverse && sudo apt-get update
sudo apt -y install virtualbox virtualbox-ext-pack

Answer ‘OK’ and ‘Yes’ to accept licensing prompts from Oracle

When installation finishes, it’s often preferable to add a link to the application by navigating to the apps menu > search for virtualbox > right-click it > add to favorites

Trigger VirtualBox app to start using the almost freeware