If your getting the following error:
Could not load the Host USB Proxy Service (VERR_FILE_NOT_FOUND). The service might be not installed on the host computer.
What worked for me was the following:
Type grep "vboxusers" /etc/group
THIS GIVES YOU SOMETHING LIKE 125
none /proc/bus/usb usbfs devgrid=125
,devmode=664 0 0