grub won't install for a fresh 12.04 computer. I don't know why.

[Rob]

Boot computer w/ thumbdrive containing 12.04 amd64. Computer now has 11.10 amd64 with separate partiitions for / and /home. Want to do fresh install of 12.04 amd64. Grub won't install, saying it cannot find device.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.10.16
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu5
Architecture: amd64
CasperVersion: 1.315
Date: Sat Apr 28 10:11:05 2012
InstallCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 TERM=unknown
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Apr 28 10:11:02 ubuntu plugininstall.py: Traceback (most recent call last):
Apr 28 10:11:02 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1735, in <module>
Apr 28 10:11:02 ubuntu plugininstall.py: install.run()
Apr 28 10:11:02 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Apr 28 10:11:02 ubuntu plugininstall.py: func(self)
Apr 28 10:11:02 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 204, in run
Apr 28 10:11:02 ubuntu plugininstall.py: self.configure_bootloader()
Apr 28 10:11:02 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1013, in configure_bootloader
Apr 28 10:11:02 ubuntu plugininstall.py: "GrubInstaller failed with code %d" % ret)
Apr 28 10:11:02 ubuntu plugininstall.py: InstallStepError: GrubInstaller failed with code 1
Apr 28 10:11:02 ubuntu plugininstall.py: