Thanks for your post mauleshjani...
I did a fresh install of 12.04 yesterday.
Can get on wired but wireless network is UNCLAIMED
I have BCM4311
Network: After doing your steps I now see the wireless network which wasn't there before.
The problems is firmware is missing and when I install and activate the Broadcom STA wireless driver supplied with 12.4 and reboot I completely lose the wireless network again.
Tried three times and the same outcome each time.