Just go to http://linuxwireless.org/en/users/Drivers/b43/ and look for "Supported Devices" section of the website, It will tell you how to find out what b43 driver your broadcom card supports, Then go to the ubuntu software center and download the right package.
After you install the right driver for your system open terminal and do -
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sudo su
nano /etc/modprobe.d/blacklist
Then add the line
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blacklist wl
Save the file and exit and reboot.
Then in terminal do -
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modprobe b43
This will load the opensource b43 driver and your wireless should work (It worked for me).
Note these instructions may differ depending on what driver your card needs.