I don't know about what setup you have, but to get things fully working there are things that have to be done. First uncomment four lines like so:
Uncomment lines 42-45 starting with #mkdir -p /dev/bus/usb/.usbfs like above.
gksudo gedit /etc/init.d/mountdevsubfs.sh
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
Svfe, then in terminal do:
You might wish to add this line to your /etc/fstab file:
sudo /etc/init.d/mountdevsubfs.sh start
Some have found this necessary for USB flash drives.
usbfs /proc/bus/usb usbfs auto 0 0 in the fstab file
Let us know how you make out.