My wireless doesn't work with Ubuntu 12.04 LTS after upgrade from 10.04.(it worked with 10.04 LTS) I have a Dell Inspiron 1501. I am a beginner in Linux. These are my hardware:
05:00.0 Network controller : Broadcom Corporation BCM4311 802.11b/g WLAN [ 14e4:4311] (rev 01) 08:00.0 Ethernet controller : Broadcom Corporation BCM4401-B0 100Base-TX [ 14e4:170c] (rev 02)
I followed the steps posted below:(from a similar tag, but...)
sudo apt-get install --reinstall bcmwl-kernel-source broadcom-sta-common broadcom-sta-source
echo "blacklist brcmsmac" | sudo tee -a /etc/modprobe.d/blacklist.conf
echo "blacklist bcma" | sudo tee -a /etc/modprobe.d/blacklist.conf
....and now i have no Network device on my PC(wired or wireless) I can use only wired connection if i start my laptop with a"previous version of Linux"...2.6.43-24...