I installed Ubuntu 12.04 armhf to my beagleboard-xm and now trying to connect to a wireless network. First, I checked if I can search for available networks:

ubuntu@arm:~$ iwlist scan
lo        Interface doesn't support scanning.

usb0      Interface doesn't support scanning.

wlan0     Scan completed :
          Cell 01 - Address: EA:7D:EF:60:C9:0B
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=70/70  Signal level=-23 dBm
                    Encryption key:on
                    ESSID:"ghostrider"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
                    Mode:Ad-Hoc
                    Extra:tsf=000000005a1ab50e
                    Extra: Last beacon: 6242ms ago
                    IE: Unknown: 000A67686F73747269646572
                    IE: Unknown: 010882848B962430486C
                    IE: Unknown: 030101
                    IE: Unknown: 06020000
                    IE: Unknown: 2A0100
                    IE: Unknown: 2F0100
                    IE: Unknown: 32040C121860
                    IE: Unknown: 2D1A2C181BFF00000000000000000000000000000000000000000000
                    IE: Unknown: 3D16010800000000FF000000000000000000000000000000
                    IE: Unknown: DD09001018020000000000

Then I edited /etc/network/interfaces file to the following:

root@arm:/etc/wpa_supplicant# cat /etc/network/interfaces
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp
# Example to keep MAC address between reboots
#hwaddress ether DE:AD:BE:EF:CA:FE

# WiFi Example
auto wlan0
iface wlan0 inet dhcp
    wpa-ssid "ghostrider"
    wpa-psk "b34d373eb2fb836a43b0afffe783c7d0af694724506c9e77b06d1021302905bf"

But I cannot still connect to the wireless network:

root@arm:/etc/wpa_supplicant# iwconfig
lo        no wireless extensions.

usb0      no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:off/any  
          Mode:Managed  Access Point: Not-Asociated   Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:on

eth0      no wireless extensions.

root@arm:/etc/network# ifup wlan0
Failed to bring up wlan0.

What is wrong? Should I change any other files also? But I think it was enough. By the way if you are curious about where that wpa-psk came from:

zero@ghostrider:~$ wpa_passphrase ghostrider 34bddf67c2
network={
    ssid="ghostrider"
    #psk="34bddf67c2"
    psk=b34d373eb2fb836a43b0afffe783c7d0af694724506c9e77b06d1021302905bf
}

I will appreciate any effort to help.

Regards, Amadeus

ps: Also I tried to connect manually:

root@arm:/etc/network# iwconfig wlan0 essid ghostrider key s:34bddf67c2

But this did not solve my problem also.