Network manager can only run an interface that does exist.

If you have any configured interfaces in /etc/network/interfaces then
network manager can do nothing with it.  Try commenting out any lines
that are in this file and see if it repairs the fault.

This is how mine currently looks and network manager is using my network
interfaces perfectly.

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

auto eth1
iface eth1 inet dhcp

auto eth2
iface eth2 inet dhcp

auto ath0
iface ath0 inet dhcp

auto wlan0
iface wlan0 inet dhcp

-- 
NetworkManager does not recognise any interface after upgrade to 2.6.20-7
https://launchpad.net/bugs/84307

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