getting USB support of Virtualbox

1. vi /etc/init.d/mountdevsubfs.sh

#
# 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

2. under Hardy Heron,
vi /etc/udev/rules.d/40-basic-permissions.rules

# USB devices (usbfs replacement)
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", MODE="0664", GROUP="vboxusers"
SUBSYSTEM=="usb_device", MODE="0664", GROUP="vboxusers"

3. restart the udev device or reboot

/etc/init.d/udev restart

4. if the above doesn't enable usb, try this

cat /etc/group | grep vboxusers
vboxusers:x:125:[userid]

vi /etc/fstab

## usbfs is the USB group in fstab file:
none /proc/bus/usb usbfs devgid=125,devmode=664 0 0

reboot or try doing,
/etc/init.d/mountkernfs.sh