I just installed ubuntu 12.04, and although I can get online with an ethernet cord, I have no wifi access.
I've run most of the code provided in this post. I'd be happy to give details, but this is what seems most important to me:
$lspci gives me a bunch of entries, including one for 02:00.0 Ethernet controller (it's an Atheros AR8152 v 1.1 if you're interested) but no wifi controller or anything.
$iwconfig returns lo and eth0, both with "no wireless extensions."
ndiswrapper is installed.
I installed ndisgtk and it says I have no wireless drivers.
I'm kind of lost and this is a pain, so if you have any ideas I'd appreciate it.