Hi, Tried the suggestion : http://ubuntuforums.org/showthread.php?t=1266620 didnot worked for me. Broadcom wireless card BCM4312 does not work on Karmic 9.10 0e:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g (rev 01) Model :- Dell Vostro 1520 Please suggest. Thanks, Kaushal