grub attempted to write to /dev/sda when /dev/nvidia RAID controller was selected for grub boot loader

[raistlin_kell]

grub failed to write to '/dev/sda' when /dev/nvidiamapper was the selected boot partition, not /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: Sun Nov 27 15:15:58 2011
LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 LANGUAGE=en_AU.UTF-8
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[raistlin_kell (subscribe-kernelpanic)]

was a fresh install from bootable USB drive

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Nov 27 15:15:56 ubuntu plugininstall.py: Traceback (most recent call last):
Nov 27 15:15:56 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1641, in <module>
Nov 27 15:15:56 ubuntu plugininstall.py: install.run()
Nov 27 15:15:56 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Nov 27 15:15:56 ubuntu plugininstall.py: func(self)
Nov 27 15:15:56 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 199, in run
Nov 27 15:15:56 ubuntu plugininstall.py: self.configure_bootloader()
Nov 27 15:15:56 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 955, in configure_bootloader
Nov 27 15:15:56 ubuntu plugininstall.py: "GrubInstaller failed with code %d" % ret)
Nov 27 15:15:56 ubuntu plugininstall.py: InstallStepError: GrubInstaller failed with code 1
Nov 27 15:15:56 ubuntu plugininstall.py: