the correct command to run this installation is
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sudo sh ./VBoxLinuxAdditions.run
Obvs you need to change directory to the desired location, if you have an error mounting the drive you can easily download the iso and mount it manually using >download_virtualbox_org/virtualbox< just by choosing your version of VirtualBox. In my case it's >download_virtualbox_org/virtualbox/6.0.4/< meaning >download_virtualbox_org/virtualbox/6.0.4/VBoxGuestAdditions_6.0.4.iso< is my download location.
Wasn't allowed to post links - change all the _ inbetween download, virtualbox, and org. To fullstops!