Comment 14 for bug 276980

Thank you for taking the time to report this bug and helping to make Ubuntu better. We are sorry that we do not always have the capacity to look at all reported bugs in a timely manner. There have been many changes in Ubuntu since that time you reported the bug and your problem may have been fixed with some of the updates. If you could test the current Ubuntu development version (10.04), this would help us a lot. If you can test it, and it is still an issue, we would appreciate if you could upload updated logs by running apport-collect 276980, and any other logs that are relevant for this particular issue.

Also please note that your card should be supported by the b43 driver, so you should try it first. However, this driver requires you to download the firmware either by installing b43-fwcutter while having an ethernet connection, or by downloading the firmware manually and then running b43-fwcutter on it.
https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx#Installing%20BCM43xx%20drivers