Once again I am having trouble with the Ralink RT2860 chipset wireless card under Ubuntu. I have had an issue with this NIC since 9.04! The problem has been that the card would not connect to wireless networks and would keep asking for a password even though it had already been entered. The fix for 9.04 and 9.10, for me, is described in this forum post. For 10.04 I found a link to this tutorial on getting the Ralink RT2860 driver reinstalled with correct settings.
Thank you Chris Barker for the guide!
http://www.ctbarker.info/2010/05/ubuntu-1004-wireless-chipsets-and-wpa.html