sanguinololu, avrdude: stk500_recv(): programmer is not responding

Hello

I am trying upload Sprinter firmware for my RepRap but I receive this message:

avrdude: stk500_recv(): programmer is not responding

Please I need solve this problem because I don't want change to windows because a friend uploaded the firmware from windows and this workes good. I have Ubuntu 12.04, sanguinololu rev 1.3a, arduino 0023.

Thanks