I just upgraded System76 Gazelle laptop to 15.04 and wifi no longer works.
It sees many networks and tries to connect to mine, but fails repeatedly (/var/log/syslog
seems to indicate authentication failure, but the password in the /etc/NetworkManager/.../my-wifi
is, of course, correct).
I tried rebooting both the laptop and the wireless modem.
I also tried Fn-F11 (which now turns on "airplane mode") with no results.
I also tried wired internet which is also ignored.
How do I restore the WiFi?