i just remembered an earlier "bug" of NM.
according to bug 45751 :
Network Manager will not see interfaces listed in /etc/network/interfaces
after removing all interfaces there everything worked fine.
assuming the primary problem is a one time issue, closing4now.
** Changed in: Ubuntu
Status: New => Invalid
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Network-manager fails to connect/recognize Centrino Intel Pro Wireless in feisty
https://bugs.launchpad.net/bugs/121965
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