Sorry for the lack of follow-up. I was able to install Kubuntu instead, which didn't seem to try and run any migration assistant. It's running so well (This is an Alpha release!?!?) that I don't want to mess around with it.
And while there is an option to disable the migration assistant if you run it from the shell, there was never a check box from the install icon on the desktop, which surely will be the only option known for anyone new to Ubuntu/Linux. -- Crash during "Migrate Documents and Settings" prevents installation from proceeding https://launchpad.net/bugs/89821 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs