I have a Motorola PEBL and have been trying to get it to work with Ubuntu for quite some time. After a bit of searching, I discovered Moto4Lin which allows me to do all kinds of fun things to the phone.
In order to successfully get your Ubuntu system and PEBL playing together nicely, here is what you need to do.
sudo aptitude install moto4lin
- Press <Alt>+F2 to bring up the run dialog and run
- Open the preferences for the program and under the connection tab change the ACM Device to /dev/ttyACM0
Hopefully this will get your phone doing what it should be.