To solve this problem and get internet working on you device you can simply run the following command on terminal:
sudo service network-manager restartAfter running this command you should see the network icon (probably as offline icon at first) on the task bar. If you have an active connection it should connect automatically. Otherwise you can click the icon and see the connection options as a list. If you have an active connection added before it should normally connect automatically unless you have cancelled automatic connection on connection settings.