Comment 6 for bug 235794

I am afraid that I already installed with the alternate installer and I have no unpartitioned space left for a trial install on the same hard disk.

But maybe I can still help you in triaging the bug. Is it possible that the installer tried to access the home folder of a previous Ubuntu installation but failed to do so, because the filesystem was encrypted using cbc-plain, for which there is no module in the live cd? In that case I could try to reproduce this situation on a USB disk. What exactly is this migration-assistant supposed to do?

Please give me some feedback whether this could be helpful before I spend time on it.