Bug 78037 may be informative. The workaround is:
sudo ifconfig [interface] down sudo iwconfig [interface] essid [essid] key [key] sudo ifconfig [interface] up sudo dhclient3 [interface]
This just worked for me using WEP through both rt2500 and prism54 cards in Feisty (bug 82711). Something like it may help with WPA.
Bug 78037 may be informative. The workaround is:
sudo ifconfig [interface] down
sudo iwconfig [interface] essid [essid] key [key]
sudo ifconfig [interface] up
sudo dhclient3 [interface]
This just worked for me using WEP through both rt2500 and prism54 cards in Feisty (bug 82711). Something like it may help with WPA.