Possible Duplicate:
How to Install Broadcom / STA Wireless card (BCM43XX)
Upgraded Ubuntu to 11.04, now wireless card does not work when I unplug the laptop
lspci -vvnn | grep 14e4
10:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM5787M Gigabit Ethernet PCI Express [14e4:1693] (rev 02)
30:00.0 Network controller [0280]: Broadcom Corporation BCM4321 802.11a/b/g/n [14e4:4328] (rev 03)