HOWTO: Getting virtualbox to see and use USB3.0 devices
The current install on 3.7.4 does not have the extensions pack installed (do not mistake this for the VboxGuestAdditions).
One can download this pack from Oracle if wanted:
Be sure to take the sha256 checksums file too as you might need the number later.
To have the same required signature, download their latest for debian10 too (remove the existing Virtualbox with "apr virtualbox-6.0 " first):
Install the downloaded .deb with "dpkg" "aptitude", "debi" or "gdebi" or whatever suits your needs best but not with "api".
After which you'll need to run the following command (in the download directory, or use full PATH) as the inhouse virtualbox GUI option does not work on Linux:
"sudo VBoxManage extpack install --replace Oracle_VM_VirtualBox_Extension_Pack-6.0.8.vbox-extpack --accept-license=6d89127c7f043fa96592da96ca87ac5ee9a7afd347d788380f91b695b67d7954" (the checksum here is the correct one for now)
And, after scrolling and accepting the license, it will be installed and you can connect USB3.0 devices.