ubiquity crashed with InstallStepError in configure_bootloader()

[Oddround]

Binary package hint: ubiquity

ubuntu@ubuntu:~$ df -h
Filesystem Size Used Avail Use% Mounted on
aufs 1005M 43M 963M 5% /
udev 1005M 256K 1005M 1% /dev
/dev/sr0 691M 691M 0 100% /cdrom
/dev/loop0 666M 666M 0 100% /rofs
none 1005M 136K 1005M 1% /dev/shm
tmpfs 1005M 16K 1005M 1% /tmp
none 1005M 88K 1005M 1% /var/run
none 1005M 0 1005M 0% /var/lock
none 1005M 0 1005M 0% /lib/init/rw
/dev/mapper/nvidia_cdhdgafd1
                      288G 2.2G 271G 1% /target
This path "/dev/mapper/nvidia_cdhdgafd1" is to a hardware RAID1 mirror.
Mirror status healthy.

ProblemType: Crash
Architecture: amd64
Date: Wed Mar 31 18:30:43 2010
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InterpreterPath: /usr/bin/python2.6
LiveMediaBuild: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
Package: ubiquity 2.0.6
ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity --only
ProcEnviron:
 LANGUAGE=
 PATH=(custom, no user)
 LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', '--only']
SourcePackage: ubiquity
Title: ubiquity crashed with InstallStepError in configure_bootloader()
Uname: Linux 2.6.31-14-generic x86_64
UserGroups:

[Oddround (oddround)]

I set-up a hardware RAID 1 mirror and when I installed Ubuntu 9.10 it went well until it needed to install GRUB.
GRUB failed to install.

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #260001, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.