Ubuntu Server 12.04 + Wifi - WPA supplicant issues

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http://askubuntu.com – I've been trying (and failing) all weekend to get my homeserver connected via Wifi (I know it should be cabled, but a house move is imminent ;-). The setup is as follows: HP N40L Microserver Ubuntu Server 12.04 LTS 64bit Edimax EW-7612UAN V2 - USB Wifi adaptor Tenda N150 Wifi Router - run 1 SSID as b/g/n mixed mode, channel 6, WPA2 Personal, AES On a fresh install of Ubuntu, my output is as follows: ifconfig ifconfig wlan0 up root@srv:/home/srvadmin# ifconfig eth0 Link encap:Ethernet HWaddr 00:9c:02:a9:27:b9 inet addr: Bcast: Mask:255.255 (HowTos)