HOWTO: Linksys WMP54G PCI Wireless Adapter on Ubuntu (Gutsy)

I have a Dell sitting in my living room with a Linksys WMP54G PCI wireless adapter installed. The adapter worked just fine under Feisty. I did an upgrade to Gutsy on the 17th, just 1 day shy of its official release, and to my horror the adapter stopped working!! No Internet connection for me.