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How do I know if VirtualBox is installed?
Open your VirtualBox and check its version by going to Help > About VirtualBox. In the current example, the installed VirtualBox version is 5.2. 16 as you can see on the screenshot below, and the newest available version is 6.0.
How do I know if VirtualBox is installed on Ubuntu?
If you’re on Ubuntu specifically, you can use “dpkg” command to check Virtualbox version. That’s it. These are couple ways to find the version of Oracle Virtualbox from Terminal in Linux.