A well-supported wireless PCI adapter for Ubuntu 12.04?
Solution 1:
https://help.ubuntu.com/community/WifiDocs/WirelessCardsSupported
Solution 2:
I went through several return/exchange cycles with both Amazon and Newegg, and finally found an adapter that works great on this site:
https://www.thinkpenguin.com/catalog/wireless-networking-gnulinux
I ended up getting this one: https://www.thinkpenguin.com/gnu-linux/penguin-wireless-n-pcie-card