Comment 5 for bug 1682637

I booted into recovery to see if there the network was working again.

It is a bug of Networkmanager. Probably the username 'power' doesn't affect the connection.

Solution:

sudo -H gedit /etc/NetworkManager/NetworkManager.conf

At the bottom of this file, copy and paste the following:

[device]
wifi.scan-rand-mac-address=no

Restart the networkmanager

sudo service network-manager restart