Connect to Wireless Network from Command Line on Ubuntu 16.04+

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With a headless server Ubuntu makes it easy to manage all network connections via network manager (nmtui interface).  Configuring a wireless LAN adapter requires more configuration than a wired LAN as an SSID / key must be specified.

List Saved Wifi Connections:

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nmcli c

List available Wifi Hotspots:

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nmcli d wifi list

Just change <WifiInterface>, <WiFiSSID>, <WiFiPassword>in the following commands to reflect your setup. If WiFi info already saved, easier way using <SavedWiFiConn> name of connection as it was saved in NetworkManager.

Using Network Manager CLI to connect to a specific Wifi network:

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##disconnect
nmcli d disconnect <WifiInterface>
##connect
nmcli d connect <WifiInterface>
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