Uninstall network-manager in Ubuntu 14

To uninstall Network Manager Completely please execute following commands:
1. Check the status of network-manager first:

sudo service network-manager status

If network-manager is running then you need to stop it first. Please execute following command to stop it.
2. Stop network-manager

sudo service network-manager stop

3. Remove network-manager completely

 sudo apt-get autoremove network-manager-gnome network-manager

You can use 'remove' or 'purge' also instead of 'autoremove'  here. The benefit of 'autoremove' is it will uninstall the dependency library also.