What's the difference between
If you added the virtualbox PPA to your system (via /etc/apt/sources.list), you will find that you now have multiple versions of virtualbox available to install.
deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian focal non-free contrib wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
As viewed in
Synaptic Package Manager, you'll see at least three different versions.
What's the difference, and which one should I install?