The above might perhaps be helpful for other Fujitsu Siemens models.
In my case, my Fujitsu Siemens Esprimo Mobile V3565 wireless adaptor does work, because it connects with routers that have no security enabled. After checking the security settings in both Windows and Ubuntu, I find no diference (and actually there is not much to select, for WPA besides "WPA home", and then "TKIP").
Any more ideas on what can I do please? Should I try to install those other drivers anyways?