Here is how the "Connect to Hidden Wireless Network" dialog used to look with Ubuntu 2011.04:
The "Wireless Security" list showed different protocols, including the one I want (WPA & WPA2 Personal)
PROBLEM: With Ubuntu 2012.04 (on another laptop), only "None" is shown in "Wireless security":
QUESTION: Why are the other options no longer available in 2012.04?
I have just installed it, it is in an out-of-the-box state.