How to force Network Manager to rescan connections?
sudo iwlist interface scan
Where interface is the name of your wireless card, e. g. wlan0
nmcli device wifi rescan
nmcli device wifi list
to see available networks
In Ubuntu 16.04 and newer, restarting NetworkManager with sytemctl works (at least after scanning the networks manually with
# Find the name of the network interface, e.g. wlan0 or wlp3s0 ip addr show # Scan for WLAN networks (replace wlan0 by the correct interface) sudo iwlist wlan0 scan # Restart Ubuntu’s Network Manager so it reloads the Access Point list sudo systemctl restart NetworkManager