In my case it also failed. I had a precreated series of /dev/md devices I set up using gdisk.
/dev/md0 for swap, /dev/md1 for root (/), and /dev/md2 for home (/home). The install died during the grub installation. Now, there is no longer an Alternate Ubuntu CD with the Debian Installer (which, sadly, after all these years and all these shiny UIs, still works better than the Ubuntu one does). So it's pretty tough to work around the problem either. I am not sure where to get all of the error logs from the install because the location of them and most of the behavior of the Ubiquity installed is undocumented as far as I can tell. It seems like it segfaulted on me after the failure. I attached the stuff I could find in /var/log/syslog. But given there's not a lot of decent workarounds I think this is a pretty severe bug... installers shouldn't segfault... Jul 28 06:33:02 kubuntu kernel: [ 3143.574987] ubiquity[29163]: segfault at 70c0000000c ip 00007f04d7379e88 sp 00007fff1862fa08 error 4 in libQtCore.so.4.8.6[7f04d71eb000+2d8000] ** Attachment added: "Logs from RAID Grub failure and Ubiquity crash" https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1315344/+attachment/4164162/+files/ubiquity-log.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1315344 Title: Grub install failed on disks with software RAID To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1315344/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs