Please don't close the bug! I have the same problem on my newly installed 
Ubuntu 15.04, the problem also seems to be the 4G modem. It worked nicely on 
14.04 and 14.10. As a workaround, I am able to start "nm-applet --version" and 
use it, but it becomes unstable after a sleep mode again. 
I don't know what @jukey means by "two entries for my mobile broadband 
connection" - but I do have only one 4G modem listed by "mmcli -L" and only one 
NetworkManager connection configured for this modem.

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https://bugs.launchpad.net/bugs/1458340

Title:
  nm-applet crashs with segmentation fault (Cannot grab information for
  modem at /org/freedesktop/ModemManager1/Modem/7: No ModemManager
  support)

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