I got exactly the same problem since upgraded to artful. My modem is
Huawei E176 (12d1:140c) and my workaround for now is to add file
/etc/udev/rules.d/99-mm-e176.rules with below content to unset
ID_MM_CANDIDATE on /dev/cdc-wdm*.
ACTION!="add|change|move", GOTO="mm_e176_end"
# E176
ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="140c", SUBSYSTEM=="usb",
KERNEL=="cdc-wdm*", ENV{ID_MM_CANDIDATE}="0"
ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="140c", SUBSYSTEM=="usbmisc",
KERNEL=="cdc-wdm*", ENV{ID_MM_CANDIDATE}="0"
LABEL="mm_e176_end"
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https://bugs.launchpad.net/bugs/1723210
Title:
mobile broadband connectie fail (timeout)
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