I just installed Ubuntu 11.04 on another computer and checked the certificates. The default certificate works fine (the one with md5, the original one from kubuntu) and I am able to connect easily to the WPA. So maybe this is an issue with the network managers running under kubuntu.
Small update:
I just installed Ubuntu 11.04 on another computer and checked the certificates. The default certificate works fine (the one with md5, the original one from kubuntu) and I am able to connect easily to the WPA. So maybe this is an issue with the network managers running under kubuntu.