If you have installed virtualbox from virtualbox.org instead of the version from the official Ubuntu repositories, this upstream bug about the same topic might also be of interest for you: https://www.virtualbox.org/ticket/7536
If you have installed virtualbox from virtualbox.org instead of the version from the official Ubuntu repositories, this upstream bug about the same topic might also be of interest for you: /www.virtualbox .org/ticket/ 7536
https:/