I’m sure that someone out there is struggling with this. So, here is a quick screenshot of the security settings, in the Network Manager applet, that you need to get Ubuntu to run on the University of Arizona’s secure wireless network. The same will apply for Debian and most GNOME-based desktops.

…and you’ll want to put your NetID username and password in there, for the last two entries.
Fairly straightforward once you get it.
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Looks similar to the way Columbia’s wireless networks authenticates (at least, back in 2006). Over on my blog I figured out how to use wpa_supplicant directly rather than relying on NetworkManager.
I can confirm this on Linux debian 3.0.0-1-686-pae #1 SMP Sun Jul 24 14:27:32 UTC 2011 i686 GNU/Linux. (Debian Testing)
UA VPN connection is also easy with a debian-based OS. Synaptic/apt-get:
network-manager-vpnc
network-manager-vpnc-gnome
vpnc
Then, using the Network Manager gui, import the University_of_Arizona.pcf file found on sitelicense, possibly in a .7z archive. Fill in netid/pass and check “Available to all users”.