If, on your AspireOne 110 with Ubuntu 9.04, you kincannot see the wifi led blinking you can execute the following commands:

gg1@piccoletto:~$ sudo -s

[sudo] password for gg1: 

root@piccoletto:~#  apt-get install linux-backports-modules-jaunty

Just wait for the completion of the last command then reboot the AspireOne.
 
Now the wifi led should work.
 
gg1