I have the same error on a clean install.

lspci:
01:06.0 Ethernet controller: Atheros Communications, Inc. AR5212 802.11abg NIC 
(rev 01)

iwconfig:
ath0      IEEE 802.11g  ESSID:"VE"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: Not-Associated   
          Bit Rate:0 kb/s   Tx-Power:18 dBm   Sensitivity=0/3  
          Retry:off   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=0/94  Signal level=-95 dBm  Noise level=-95 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

[EMAIL PROTECTED]:~$ sudo iwconfig ath0 mode master
Error for wireless request "Set Mode" (8B06) :
    SET failed on device ath0 ; Invalid argument.
[EMAIL PROTECTED]:~$ sudo iwconfig ath0 mode Master
Error for wireless request "Set Mode" (8B06) :
    SET failed on device ath0 ; Invalid argument.

I have D-Link DWL520 Rev. B3.

-- 
Cannot set modes other than 'Managed' on Atheros based wifi card
https://launchpad.net/bugs/62106

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