No WiFi after 'Install Upgrades' on start menu

[banko]

I had this problem and it was solved by connecting via Ethernet,
then do a full system update

Code:

sudo apt-get update

then

Code:

sudo apt-get upgrade

then reboot,
then run following

Code:

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

see if it springs to life.