virtualbox.org

I believe I've done what all my research suggests, but when i 'vboxmanage list usbhost' shows <none>
I'm a user: vt@main:~$ groups bvt
bvt : bvt adm cdrom sudo dip plugdev lpadmin lxd sambashare vboxusers

Did you reboot or logout/login after adding your user to the vboxusers group?