Broadcom Wireless not working in Ubuntu (solved)

After upgrade to 12.04 the Broadcom wireless adapter stopped working again, following steps fixed for me:

First check your wireless adapter is in revision 43 range

lspci -nn|grep -i broad
04:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM5787M Gigabit Ethernet PCI Express [14e4:1693] (rev 02)
05:00.0 Network controller [0280]: Broadcom Corporation BCM4311 802.11b/g WLAN [14e4:4311] (rev 01)

1. Remove jockey wireless driver
2.  sudo apt-get remove bcmwl-kernel-source
3.  sudo apt-get install firmware-b43-installer b43-fwcutter
4.  sudo vi /etc/modprobe.d/blacklist.conf
   and comment out the line that says "blacklist bcm43xx"
5.  sudo vi /etc/NetworkManager/NetworkManager.conf
   and change managed to true.
6. reboot

Note: you might need to issue sudo rfkill unblock wifi if your wi-fi is switched off by the button on your laptop.