OK, SOLVED:
I had to remove Modem Manager
#apt-get remove modemmanager
As a reference, see also
labs.arduino.org/Arduino+IDE+on+Linux-based+OS
thanks
OK, SOLVED:
I had to remove Modem Manager
#apt-get remove modemmanager
As a reference, see also
labs.arduino.org/Arduino+IDE+on+Linux-based+OS
thanks