problem im my key 3G "Connection activation failed" in 14.04

Question

I have a little problem in my Trusty. To beginn with, my mobile broadband works 100% but there is another connection that appears to be simultaneous.

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When I click the new connection the following message appears: following

Connection activation failed
(1) Creating object for path '/org/freedesktop/NetworkManager/ActiveConnection/1' failed in libnm-glib.

If I then click on connection name option of my key the following message appears:

Connection activation failed
(32) The connection was not supported by oFono.

When I want to create a new connection the Create a connection for Mobile BroadBand option contains two choices empty any device

Solution 1

None of the above solutions worked for me in Ubuntu 14.04

The thing that worked:

1. Remove your broadband connection (right clicking Network applet > Edit Connections)
2. Reboot
3. Add connection again

This worked for me.

Solution 2

Instead of restarting the machine. Restarting network-manager, which is actually causing the problem, solves the problem. Restart of network-manager forces all connections to be re-established.

Enter this command in a terminal:

sudo service network-manager restart

After you are prompted for and enter your password, this will restart the network manager.

Comments

[Eliah Kagan]

I recommend expanding this answer (through editing) to explain why you expect restarting NetworkManager might fix the problem.

[Daniel]

This worked for me as well. :)