Migration-Assistant doesn't seem to be working for me; I was using the 64bit version of herd 5. When I try to install normally, I can proceed through the install to the migration-assistant step. At this point the crash-helper thing pops up saying ubiquity crashed, and the window sits there "thinking" indefinitely. I tried passing --no-assistant (or whatever it was) through the command line and got through all the install phase, unfortunately just before it finished it crashed. The console showed that it appeared to have been trying to do something involving the assistant when it crashed. This unfortunately messed up grub and became a PITA to fix.