I tried this with the precise-desktop ISO and the behavior is a bit different. Here's what I did, please verify that it's a useful/accurate reproduction of your issue.
When I got to the erase/something else screen, I chose the latter (essentially, manual partitioning). I created a new partition table, and then an 8GB root partition on /dev/vda1, which I made an XFS file system. Then I put the remaining 500MB or so on /dev/vda2. I told the partitioner to install the boot loader on /dev/vda1. At the end of the installation, I got a popup window saying: Executing 'grub-install /dev/vda1' failed. This is a fatal error. All you can do at this point is click OK. Note that /var/log/syslog has the grub-installer warning mentioned in comment #6, but no Python traceback. I'm inclined to say that this specific bug is no longer valid, so I'm going to close it. However, if you can still reproduce it with the latest 12.04 live CD, please re-open this bug and provide addition information (e.g. recipe for reproduction, log entries, etc.). The fact that you are even given the opportunity to install grub on an unsupported file system like XFS will be fixed as part of bug 959724. ** Changed in: ubiquity (Ubuntu) Status: Triaged => Invalid -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to ubiquity in Ubuntu. https://bugs.launchpad.net/bugs/933433 Title: Kubuntu manual install crashed during bootloader configuration on an XFS partition To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/933433/+subscriptions -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs