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Ubuntu - Network - Netplan - Connection to Wifi Open Network

Here is a working YAML file for connection to local WPA2 wifi Network.

Create this file in /etc/netplan.

network:
    version: 2
    wifis:
        wlan0:
             renderer: NetworkManager
             match: {}
             dhcp4: true
             access-points:
                 "open network": {}

An assumption is that there is only one wifi device in the system. If this is not true, replace match: {} with something more specific.

In YAML, indentation matters, so ensure that this is maintained in the YAML config file.

Run the following to enable the change:

netplan generate; 
netplan apply

and things should work.

You can file bugs on Launchpad.