Most mobile OSes have a button to re-check for new Wifi networks. In Ubuntu I know I can
iwlist wlan0 scanand see the results printed
disable and re-enable Wifi in the Network indicator
sudo service network-manager restartand restart the whole thing.
wait for it to automatically re-scan for new networks
Q: Is there a way to nudge Network-Manager to re-scan for networks, besides nuking it as above?