Ubuntu – DSL connection problem after installing Ubuntu 15.04

15.04internetnetwork-managernetworking

I have just installed Ubuntu 15.04. I tried to connect with my broadband DSL connection. When I entered the cable it was showing that it could recognize the cable. Then from edit connection I added a new DSL Network Connection and configured with my username and password. Then when I tried to connect through the new configured DSL connection it prompts up a message saying "Connection activation failed. (1) Creating object for path '/org/freedesktop/NetworkManager/ActiveConnection/5' failed in libnm-glib.".
Here is the screenshot of the prompt: http://pasteboard.co/3HlwTSl.png

What is the problem? How do I resolve it?

Best Answer

It seems that network-manager is broken.

Download network-manager packages by following command while internet connection is active. 

sudo apt-get install -d --reinstall network-manager network-manager-gnome

Purge network-manager packages. 

sudo apt-get purge network-manager-gnome network-manager

Reboot the system and re-install it. 

sudo apt-get install network-manager-gnome network-manager
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