While using VirtualBox you may get this error “Failed to access the USB subsystem.
VirtualBox is not currently allowed to access USB devices. You can change this by adding your user to the 'vboxusers' group. Please see the user manual for a more detailed explanation.” to fix this you must add yourself to the vboxusers group.

To fix that error follow these steps:

1: Enter this into the terminal, gpasswd -a 'yourusername' vboxusers
2: Logout of your account then log back in.
3: Open up VirtualBox and USB support should be enable. Sellect the USB drive like you would on Windows.