can't connect to any wifi Dell Laitude D820

[GothSpark Imvu]

hi,
I installed lubuntu on a dell latitude D820 but, the wifi does not work
I installed the B43 frimware using :
sudo apt-get install b43-fwcutter firmware-b43-installer

but still can't connect to any wifi.   I can see that my wifi network
is snown I enter the right password but it can't connect  to it , (
yes i checked the router, rebooted it,)
I followed that http://ubuntuforums.org/showthread.php?t=1890109
but hardly had more result.
so  em how do I fix this junk.