Installer crashed, unable to write GRUB to /dev/sda

[Ted Spence]

Installing on a RAID5 array using an Intel H67 motherboard embedded raid controller. The installer threw the error "unable to write GRUB to /dev/sda".

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: ubiquity 2.8.7
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CasperVersion: 1.287
Date: Fri Apr 20 09:00:14 2012
LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 LANGUAGE=
 PATH=(custom, no user)
 LANG=en_US.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Apr 20 09:00:09 ubuntu plugininstall.py: Traceback (most recent call last):
Apr 20 09:00:09 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1641, in <module>
Apr 20 09:00:09 ubuntu plugininstall.py: install.run()
Apr 20 09:00:09 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Apr 20 09:00:09 ubuntu plugininstall.py: func(self)
Apr 20 09:00:09 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 199, in run
Apr 20 09:00:09 ubuntu plugininstall.py: self.configure_bootloader()
Apr 20 09:00:09 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 955, in configure_bootloader
Apr 20 09:00:09 ubuntu plugininstall.py: "GrubInstaller failed with code %d" % ret)
Apr 20 09:00:09 ubuntu plugininstall.py: InstallStepError: GrubInstaller failed with code 1
Apr 20 09:00:09 ubuntu plugininstall.py:

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Phillip Susi (psusi)]

You appear to be using a fakeraid. You therefore need to install grub to the fake raid array ( /dev/mapper/isw_ccccjejaag_VOL1 ), not one of the individual drives.