Installer attempted to install grub on wrong device

[GrumpyPiano]

/boot installed to /dev/sdb1, /usr installed to /dev/sda1. Installer attempted to install grub on /dev/sda

Release: Oneiric Live Disk

Expected grub to be installed where /boot is.
Instead installer attempted to install grub on wrong device and failed with a "fatal error".

Simple way to workaround (which I will try now) is to but /boot on /dev/sda1.
But the installer (ubiquity) should know better :P

BTW it's an awesome program.
Thanks a bunch

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 i686
ApportVersion: 1.23-0ubuntu3
Architecture: i386
CasperVersion: 1.287
Date: Tue Nov 1 15:08:14 2011
LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 LANGUAGE=en_CA.UTF-8
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Nov 1 15:08:09 ubuntu plugininstall.py: Traceback (most recent call last):
Nov 1 15:08:09 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1641, in <module>
Nov 1 15:08:09 ubuntu plugininstall.py: install.run()
Nov 1 15:08:09 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Nov 1 15:08:09 ubuntu plugininstall.py: func(self)
Nov 1 15:08:09 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 199, in run
Nov 1 15:08:09 ubuntu plugininstall.py: self.configure_bootloader()
Nov 1 15:08:09 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 955, in configure_bootloader
Nov 1 15:08:09 ubuntu plugininstall.py: "GrubInstaller failed with code %d" % ret)
Nov 1 15:08:09 ubuntu plugininstall.py: InstallStepError: GrubInstaller failed with code 1
Nov 1 15:08:09 ubuntu plugininstall.py: