Installer fails to install grub, then crashes

[Richard Oak]

Attempting to install Ubuntu 14.10 on a software RAID across 2 1TB disks. I've built a RAID using the instructions here (http://blog.tshirtman.fr/2014/5/4/install-ubuntu-desktop-on-software-raid)

I've given the disks a 1Gb partition to install grub or boot onto, but that fails, and then the installer crashes

ubuntu@ubuntu:~$ lsb_release -rd
Description: Ubuntu 14.10
Release: 14.10
ubuntu@ubuntu:~$

Running off the 14.10 installer CD

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: ubiquity 2.20.0
ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
Uname: Linux 3.16.0-23-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CasperVersion: 1.345
Date: Sun Jan 25 10:47:24 2015
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
ProcEnviron:
 LANGUAGE=en_GB.UTF-8
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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