... and these steps are also necessary to be able to fully use Network Manager:

* Add user to the netdev group.

* Create /etc/polkit-1/localauthority/50-local.d/org.freedesktop.NetworkManager.pkla with these settings:

[nm-applet]

Identity=unix-group:netdev

Action=org.freedesktop.NetworkManager.*

ResultAny=yes

ResultInactive=no

ResultActive=yes

* Reboot.