Comment 34 for bug 569841

It may be a duplicate, but I am not sure. That problem seems to affect Karmic as well, this problem certainly did not, and is in fact solved by downgrading to the Karmic kernel. Also, this bug is certainly not related to the network manager package, as I tried uninstalling it and configured the network manually. Finally, the other bug describes changing to WPA2 / AES on the access point as a workaround, I tried that to no avail.