Please have a look at the solution in this bug: https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/686418
The solution blocks modemmanager to access the QDL device (for firmware loading). If modemmanager accesses /dev/ttyUSB0 while gobi-loader still runs, it corrupts the firmware load and the modem stays uninitialized. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/647471 Title: gobi-loader does not start at boot via udev -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs