[ubuntu] Network manager forgetting WPA password

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http://ubuntuforums.org – Booted up my laptop with wireless disabled (using the little switch on the laptop). I flipped the switch, network manager showed all the wireless networks, but didn't connect to any. So I picked mine, and it asked for the WPA key. Now normally (if I had booted with wireless enabled) it would connect without asking for the WPA key. So I rebooted again with wireless enabled this time, and same deal. It seems that it's just forgotten the key altogether. I put in the key and it's all back to normal, but I'd like to know where/how network manager is storing the WPA key, and why it forgot it. Thanks (HowTos)