Wireless card (Broadcom BCM4328) not enabled by default :

While purchasing my laptop Dell Inspiron 1525 I opted for the better wireless card BCM4328 ( I don`t remember the exact name) . This was enabled by default on clean installation of Ubuntu 8.10 but not in 9.04 release. After spending some time on google I found the fix. The solution is to remove modules of other generic broadcom cards and load the latest module. In terminal,

sudo modprobe -r b43 b44 ssb wl
sudo modprobe wl

After typing above in terminal, the wireless car was immediately detected and I was able to use my home wireless network again.