By default, USB support doesn’t work in Gutsy even if you download the latest and greatest here.

To remedy this:

  1. alt+f2, gksudo gedit /etc/init.d/mountdevsubfs.sh
  2. Look for the part about magic and make it say this:
  3. #
    # Magic to make /proc/bus/usb work
    #
    mkdir -p /dev/bus/usb/.usbfs
    domount usbfs "" /dev/bus/usb/.usbfs -obusmode=0700,devmode=0600,listmode=0644
    ln -s .usbfs/devices /dev/bus/usb/devices
    mount --rbind /dev/bus/usb /proc/bus/usb

  4. Save the file and run the script via alt+f2, gksudo /etc/init.d/mountdevsubfs.sh
  5. Restart VirtualBox and bask in the glory of a USB icon under Settings for your virtual machine