No WiFi after 'Install Upgrades' on start menu

[gold_finger]

Simplest thing would be to find out which is correct driver before running updates (while wifi is working); otherwise you'll need to connect via ethernet cable to install driver after updates.

Go to this web page, scroll down to "Supported devices" section, run the command shown (same one I posted before), then match your output to what's shown on the chart.  You need to find out if the regular "b43" driver or the "b43legacy" driver is what you need.  If you see "yes" in the "Supported?" column next to your device, then you need "b43" and can install with commands supplied by banko.  If you see "yes (b43legacy)", then you need the legacy driver.

You can install either of those drivers using Synaptic Package Manager also.  Just go to Menu -> System -> Install/Remove Software; hit the reload button (upper left) and wait a minute or so until it updates itself; then click Search and type in "b43" (without the quotes).  Mark either "firmware-b43-installer" or "firmware-b43legacy-installer" package for installation depending on which one you need.  Reboot computer after the driver has been installed and you should be fine when running updates after that.