I have the same problem. This error appears after reconnecting a few
times. The error is more frequent if the connection fails once due to
GSM network problems. After the error appears the modem does not work
again until I kill the "modem-manager".
IMHO following log message is the most important one:
Apr 19 18:04:44 laptop-hostname NetworkManager: <WARN> stage1_prepare_done():
GSM modem connection failed: (32) Sending command failed: device is not enabled
I have no clue what "device is not enabled" means, but it apparently
prevents the modem from being used.
** Also affects: modemmanager
Importance: Undecided
Status: New
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USB Modem wont connect after modem hangup
https://bugs.launchpad.net/bugs/566812
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