Comment 7 for bug 160394

I've got the same problem with network-manager. I'm on Kubuntu, and I'm using it with the Knetworkmanager applet.

Selecting a wireless network from the list won't get me a connection. Knetworkmanager says "Connection failure", and re-connects to the wired connection.

However, unplugging the LAN cord causes network-manager to get connect to wireless instantly (often but not always).

I'm attaching /var/log/syslog and dmesg for the timeframe of the event (choosing wireless network (eth1) in knetworkmanager, while the LAN cord is connected).