this post is for people who may have the same problem as i had.
i've a Toshiba a201 with Atheros AR5007EG (named AR5006EG in gusty) now name AR242x in hardy.
anyway, to make it work:
- disable both restricted drivers in System > Adminstration > Hardware drivers
- install ndiswrapper in the add/remove window
- download the .inf from the XP driver at : http://blakecmartin.googlepages.com/...-32-0.2.tar.gz
- open a terminal and type this command : sudo ndisgtk
- select the net5211.inf file and "enter"
- it should now work
i hope this help.