Problems Joining WiFi On First Boot Edit on GitHub

There is a bug in the program that manages networking, network-manager, which prevents wireless networks from being shown the first time the computer is used. This issue is present even if a WiFi access point was joined during the new user setup.

To join an access point, the computer can be restarted, or this command can be run:

sudo systemctl restart NetworkManager.service

There is a bug report filed here:

Bug 1576024

Any additional people that mark Does this bug affect you? on that bug report will help gain additional traction from developers to get this issue resolved.