Wireless doesn't work on a Broadcom BCM4312
I have been using Ubuntu since 9.04 and am upgrading with every new version release. Recently I have upgraded my laptop Dell inspiron 1525 from 11.10 to 12.04. At the time of upgrade there were some problems which got cleared after trying upgrade for 3 to 4 times. Before my first upgrade, i.e. in 11.04 I was able to connect to my wireless network. After the upgrade I am unable to see the Wireless network option enabled in the networks shortcut on menu bar. Please help me to overcome this problem.
PS: I am able to use the wired network.