Broadcom Corporation wireless card not detected after upgrade to 12.04

[agatau]

wireless stopped working after upgrade to 12.04

Dell Studio XPS 16, 64bit Kubuntu, Broadcom Corporation BCM4312

[agatau]

after carefully examining the output of the dmesg I realized that the firmware files for my particular card were not installed by the ubuntu installer. here is the command that solves this issue

sudo apt-get install firmware-b43-lpphy-installer

once you execute it, reboot the machine and everything will be fine
finally, I'm just wondering why the system installer, in spite of detecting the card, did not install the appropriate firmware