I installed 8.10 on my Toshiba Satellite A100 laptop the other night. It has an Atheros AR5006EG wireless card, and Ubuntu is able to see wireless networks but I cannot connect to any of them.
I tried to connecting to routers secured with WPA, WPA2, WEP and with no security. It can never connect.
I also tried using madwifi but I got the same result.