Step 1 – Remove the Gnome Network Manager: You need to complete this step first because if left installed this application will overwrite any changes you make to your configuration when the system is rebooted. This is apparently where the bug is located.
To remove the Gnome Network Manager issue the following command in the terminal:
(This command is optional)
sudo update-rc.d -f NetworkManager remove
This will disable and remove the Gnome Network Manager application. Now you will have to edit your configuration manually.
Restart your System