Below is a comparison of two commands run from a working version and a non-working version. Like agcjh I have no iwlagn.config file in either of these versions. The 11.10 version is a fresh install on this computer and the 11.04 version is run live from USB on the same system. When I ran these commands I was at a location with only one access point in range and no security on it.

**** 11.10 ****
Code:
$ uname -r
3.0.0-12-generic

$ cat /etc/modprobe.d/iwlagn.conf
cat: /etc/modprobe.d/iwlagn.conf: No such file or directory

$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
**** 11.04 ****
Code:
$ uname -r
2.6.38-8-generic

$ cat /etc/modprobe.d/iwlagn.conf
cat: /etc/modprobe.d/iwlagn.conf: No such file or directory

$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"welcometodu"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: 00:23:EB:62:4C:C0   
          Bit Rate=65 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=60/70  Signal level=-50 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:27   Missed beacon:0
I will try your more recent suggestion. If you have any other suggestions you would like to show output for from the working versus non-working versions let me know.

Thank you much for your help