What a pain! I recently reinstalled Ubuntu 11.10 on my Dell Latitude D630 and wireless wasn't working. It wasn't picking up any connections. My driver BCM4312 802.11b/g LP-PHY for some reason wasn't installed and when I went to Ubuntu "System settings->Additional Drives" and tried to activate the Broadcom STA wireless driver I would get an error to check /var/log/ folder that didn't exist.
So I connect to the internet using a wire connection and ran this in the terminal
$ sudo apt-get install b43-fwcutter
rebooted the computer then went back to "System settings->Additional Drives" tried to activate the driver again and it worked.
Resources:
https://help.ubuntu.com/11.10/ubuntu-help/net-wireless-troubleshooting-device-drivers.html
http://askubuntu.com/questions/95852/how-to-fix-bcm4312-driver-problem
https://www.evernote.com/shard/s18/sh/d245d647-45aa-474d-b093-a6346c7e9e27/e56bca9b17d774858fb6900cd302d047
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