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

[Uwe Kaminski]

This bug is regarding the nm-applet only. I am able to use WiFi and 4g modem connections without any problem but I do not have a GUI to manage the connections or choose one as the applet does crash whenever I try to run it:

This is howit looks like:
(nm-applet:9942): nm-applet-WARNING **: Cannot grab information for modem at /org/freedesktop/ModemManager1/Modem/7: No ModemManager support
Speicherzugriffsfehler (Speicherabzug geschrieben)

Where do I find the core dump in order to provide it as well?

Any idea howto fix this issue?

My setup:

I am using a Lenovo x240 laptop and a ThinkPad EM7345 4gLTE modem (see http://support.lenovo.com/us/en/documents/pd031021 for details) .

There is no package called 'network-manager-applet' so I provide the data for 'network-manager': 0.9.10.0-4ubuntu15.1

Ubuntu Version: 15.04

[Uwe Kaminski (jukey)]

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.

[Armin Breiteneder (armin-breiteneder)]

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.

[Uwe Kaminski (jukey)]

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.

[Uwe Kaminski (jukey)]

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.

[Andre (andrei-b-taru)]

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.

[Uwe Kaminski (jukey)]

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).

[littlelion (the-littlelion)]

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