sudo apt-get install bcmwl-kernel-source
我的無線網卡是BCM4312 802.11b/g
在12.04 會集成驅動，裝完就能用，
現在用14.04，16.04里面沒集成！
軟件包: bcmwl-kernel-source (6.30.223.141+bdcom-0ubuntu2) [restricted]
yilai:
dkms
Dynamic Kernel Module Support Framework
libc6-dev
Embedded GNU C Library: Development Libraries and Header Files
linux-libc-dev
Linux Kernel Headers for development