Problem in Precise Pangolin 12.04 with the Broadband 43xx Wireless Card: Unable to download firmware for wireless. (Also works for 11.10, 11.04, 10.10 and 10.04)
From the 'Additional Drivers' section:
Possible Solutions:This package contains Broadcom 802.11 Linux STA wireless driver for use with Broadcom's BCM4311-, BCM4312-, BCM4313-, BCM4321-,BCM4322-, BCM43224-, and BCM43225-, BCM43227- and BCM43228-basedhardware.
Solution 1: After installing with the alternate cd, I needed a cable and after updating, I was able to download the STA driver through the 'Additional Drivers' section.
Solution 2: Another option is here.
Solution 3: System > Administration > Synaptic Package Manager > Search: firmware-b43-lpphy-installer > Click Mark > Click install > Close (This has been removed starting with 11.10 - Oneiric Ocelot. It may be installed with the Ubuntu Software Manager.)
Kontza found the solution (post #3), so thank him for it.
This solution fixed this problem on my Dell Inspiron 1545 with a Broadcom 4312 card. (Card Tech Specs: 0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01))
Note: For 12.04 and earlier models, the original postings are here.