How to let NetworkManager manage WLAN interface after upgrade?

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http://askubuntu.com – I upgraded a Ubuntu system to 11.10 via do-release-uprade. Now some things does not work as before. For example my user needs now to be part of the scanner group to be able to use xsane etc. - with < 11.10 this apparently was not needed. To be able to use nm-applet again (for wired networking) I needed to add the user to the group netdev after the upgrade. But WLAN management still does not work via NetworkManager - nm-applet just does not display any wireless devices. In the logs there is: NetworkManager wlan0 deactivating device reason managed (inter-punctuation removed) But why (HowTos)