Well, cbwiccan left, but ....
Sometimes if we start gtKam as user it doesn't work, but if we start gtKam as root it works.
If we add this line to fstab
usbfs /proc/bus/usb usbfs rw,devmode=0666 0 0gtKam works for user
Could someone explain to me what devmode=0666 stands for
If I change the number it doesn't work. Neither does this line -- none /proc/bus/usb usbfs defaults 0 0