Comment 3 for bug 732013

It does ask you to upgrade a 11.04 install to 11.04. I just did it from 32 bit to 64 bit and it didn't boot up afterwards. It turns out I had the linux-generic-pae (32 bit) kernel package installed which it thinks is newer then the linux-generic (64 bit) package..

After manually changing that, (it appears I will have to manually remove the linux-generic pae kernel as well) everything seems to be working fine. (Although none of my apps were transitioned)