Hello i'm using Ubuntu 8.04

when I'm give your commands.

savvas@savvas-desktop:~$ lspci -nn |grep -i atheros
02:0a.0 Ethernet controller [0200]: Atheros Communications Inc. AR5212/AR5213 Multiprotocol MAC/baseband processor [168c:0013] (rev 01)
savvas@savvas-desktop:~$ lsmod |grep ath
savvas@savvas-desktop:~$ sudo modprob ath_pci
[sudo] password for savvas:
sudo: modprob: command not found
savvas@savvas-desktop:~$ iwlist scan
lo Interface doesn't support scanning.

eth0 Interface doesn't support scanning.

savvas@savvas-desktop:~$ modinfo ath_pci |grep version
modinfo: could not find module ath_pci
savvas@savvas-desktop:~$ uname -m
i686
savvas@savvas-desktop:~$