Restricted Drivers, and enable the firmware for broadcom 43xx chipset family, then it will pop-up a window ask you to slect the firmware to download, pls choose the second one which is http://xeve.de/down/wl_apsta.o ,after finishing the download,ubuntu will automatically install the firmware.

 For the sound card, i am still under searching a way to solve it.Hope someone can give me a hand.