Comment 2 for bug 993460

This might be relevant. UbiquitySyslog.txt contains the messages below. In particular, there is the grub-installer error message "Auto-detection of a filesystem of /dev/sdd1 failed."

May 2 18:27:44 ubuntu grub-installer: info: Installing grub on 'dummy'
May 2 18:27:44 ubuntu grub-installer: info: grub-install supports --no-floppy
May 2 18:27:44 ubuntu grub-installer: info: Running chroot /target grub-install --no-floppy --force
May 2 18:27:45 ubuntu grub-installer: /usr/sbin/grub-probe: error: unknown filesystem.
May 2 18:27:45 ubuntu grub-installer: Auto-detection of a filesystem of /dev/sdd1 failed.
May 2 18:27:45 ubuntu grub-installer: Try with --recheck.
May 2 18:27:45 ubuntu grub-installer: If the problem persists please report this together with the output of "/usr/sbin/grub-probe --device-map="/boot/grub/device.map" --target=fs -v /boot/grub" to <email address hidden>
May 2 18:27:45 ubuntu grub-installer: error: Running 'grub-install --no-floppy --force failed.
May 2 18:30:04 ubuntu ubiquity[8688]: Reverting lockdown of the desktop environment.
May 2 18:30:04 ubuntu activate-dmraid: No Serial ATA RAID disks detected
May 2 18:30:04 ubuntu plugininstall.py: log-output -t ubiquity umount /target/cdrom
May 2 18:30:04 ubuntu finish-install: Disabling CD in sources.list
May 2 18:30:04 ubuntu plugininstall.py: Exception during installation:
May 2 18:30:04 ubuntu plugininstall.py: Traceback (most recent call last):
May 2 18:30:04 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1735, in <module>
May 2 18:30:04 ubuntu plugininstall.py: install.run()
May 2 18:30:04 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
May 2 18:30:04 ubuntu plugininstall.py: func(self)
May 2 18:30:04 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 204, in run
May 2 18:30:04 ubuntu plugininstall.py: self.configure_bootloader()
May 2 18:30:04 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1000, in configure_bootloader
May 2 18:30:04 ubuntu plugininstall.py: "GrubInstaller failed with code %d" % ret)
May 2 18:30:04 ubuntu plugininstall.py: InstallStepError: GrubInstaller failed with code 1