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

I figured out that the applet does not crash if I enter:

nm-applet --version

If I run

nm-applet

it crashes again as described in the initial bug report.

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please answer these questions:

* Is this reproducible?
* If so, what specific steps should we take to recreate this bug?

This will help us to find and resolve the problem.

It happened to me with a freshly installed Ubuntu version. It worked fine with 14.10 and 14.04.

So all you need to do is to install Ubuntu 15.04 and configure a modem connection using the network manager applet.

I also will try to reproduce this error from scratch. Maybe also an USB stick version will do the job.

It seems I was able to solve the problem. Not sure how that was possible but there were two entries for my mobile broadband connection listed. I never added a second one. However as described below I was able to run the nm-applet using '--version'. This allowed me to remove one of the entries for mobile broadband connections. Now the problem is gone and this bug could be closed.

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.

This problem appers to me again as well. The behaviour is exactly as described by Andre in the previous comment.

For this reason I set this bug into the confirmed status. The nm-applet could not be considered as stable in the current stable ubuntu distribution (15.04).

I've got the same problem after updating from vivid to wily.

Usually one of the wi-fi or mobile internet connections are affected. The problem arises occasionally, somtimes immediately after bootup, sometimes ater resume from sleepmode. If it's the case in the syslog appears a similar warning how described in the initial post.
Additionally this warning occures:
gnome-session[1487]: (nm-applet:1690): nm-applet-WARNING **: ModemManager is not available for modem at /org/freedesktop/ModemManager1/Modem/0