I'm trying to disable R&D mode from ubuntu with the flasher 2.0 & my iT2006 n770 but this is what I get

ubuntu@ubuntu:/media/Kingston$ ./flasher-2.0 --disable-rd-mode --reboot
flasher v0.8.1 (May 30 2006)

Suitable USB device not found, waiting
USB device found found at bus 001, device address 006
Error claiming USB interface: Operation not permitted

any ideas how to get it to work?