The immediate crash you encountered is already fixed in my working tree for ubiquity 1.1.3:
* Fix typoed variable name while raising InstallStepError. However, it does seem that the validation I tried to add for XFS doesn't work, and I think I might see why (fstype is None at that point). The question remains of how to fix it. -- When installing with /boot as an XFS partition, the installer crashes https://launchpad.net/bugs/53642 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
