Please run the steps at https://wiki.ubuntu.com/DebuggingModemmanager
and attach the debug info here. Thanks!
** Package changed: udev (Ubuntu) => modemmanager (Ubuntu)
** Changed in: modemmanager (Ubuntu)
Status: New => Incomplete
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mobile broadband huawei 1550 doesn't log on
https://bugs.launchpad.net/bugs/584331
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