ubiquity doesn't handle the grub+xfs thing at all, it just crashes.
I booted the i386 live DVD on a laptop, and shrunk the windows
partition, then used the install menu item. I don't think I did
anything to confuse ubiquity, but I hadn't used it before. (I'm used to
installing Debian with the debian-installer menu interface, but I wanted
to try this install thing in the menu...)
Anyway, I made / and /home XFS, and I didn't use a /boot. Ubiquity
died right at the end, with no warning that I could have a GRUB+XFS
problem. (At least I don't think it warned. Maybe it did, but it
wasn't very emphatic about it, so it sounded like it wouldn't hurt to
try.) In any case it shouldn't crash, it should recognize that grub
failed.
I saved the error logs and stuff, so I can create a new bug # if you
want. I thought there looked like plenty of bugs open already about the
installer crashing.
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Grub will not install to XFS Formatted Partition
https://launchpad.net/bugs/13851
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