I am brand new to ubuntu and I just installed 12.04 on my dell, had winxp before and the wireless worked just fine.

I was reading other posts with solutions like uninstalling the preset drivers and everything but didn`t work so i decided to post.

lspci -nn | grep 0280 output was

0c: 00.0 network controller [0280]: Broadcom Corporation BCM4311 802.11b/g WLAN [14e4:4311] (rev 01)