Yup, ath9k should be the module and it's been in the kernel since 2.6.27, I believe.
As said, make sure the wireless-tools package is installed.
Check if the module is loading
If that shows nothing try loading it
Code:
sudo modprobe ath9k
Check if that now shows the device
Try bring the device up
Code:
sudo ifconfig wlan0 up
And last try installing backported wireless modules for Lucid
Code:
sudo apt-get install linux-backports-modules-wireless-lucid-generic