I have a WPC 54G wireless card from Linksys (now a unit of Cisco, of which I own a few shares). I had used this card in my initial Ubuntu install which I think was 5.04. After upgrading I was unable to get the card to work in 5.10 throug 6.10. .
I upgraded to Feisty Fawn (7.04) on Friday (20th April) and still couldn’t get the card to work. I found a good HOW TO at Ubuntu Forums. I followed the directions and “WOW” it’s working again. I’ve read in some of the posts to this HOW TO that the card doesn’t deliver 54mbps with this patch, but I expect its greater range will be enough of an improvement for me.