After updating from 11.3 to 11.4 the networkmanager stopped working for me. When I hover over the KDE NetworkManager icon it says Error: Invalid state. If I click it, it says Network Management disabled and checkboxes (Enable networking and enable wireless - both checked).
I already tried removing /var/lib/NetworkManager/NetworkManager.state and restarting the network management (/etc/init.d/network restart). Also reinstalling the NetworkManager package didn’t help.
Anyone have a clue on how I can fix this?