Finally, I got the desktop live CD. I made 10 reboots using Lucid and 9 times out of 10 the modem was correctly connected to ttyUSB0. Once the modem was not detected at all but it was never connected to ttyUSB2.
I made only ten reboots but with the Ubuntu versions I've been using during the last two years the modem was connected to ttyUSB2 more than 50% of times, so as far as I can see my problem should be solved with Lucid.
Finally, I got the desktop live CD. I made 10 reboots using Lucid and 9 times out of 10 the modem was correctly connected to ttyUSB0. Once the modem was not detected at all but it was never connected to ttyUSB2.
I made only ten reboots but with the Ubuntu versions I've been using during the last two years the modem was connected to ttyUSB2 more than 50% of times, so as far as I can see my problem should be solved with Lucid.
Thanks a lot.
Ciao,
Max