Mythbuntu 14.04 crashes during install

Mythbuntu 14.04 crashes during install and the installation is not able to proceed.

Both the x64 (amd64) and x86 (i386) installers crash during install with the same error.

Tested on a VMware Workstation v9 VM and found the same issue.

Tested installing Ubuntu 14.04 x64 on the same hardware. This installs successfully.

mythbuntu@mythbuntu:~$ lsb_release -rd
Description: Ubuntu 14.04 LTS
Release: 14.04

mythbuntu@mythbuntu:~$ apt-cache policy ubiquity
ubiquity:
  Installed: 2.18.7
  Candidate: 2.18.7
  Version table:
 *** 2.18.7 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

Motherboard: Gigabyte H81M-S2PH

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.18.7
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CasperVersion: 1.340
Date: Sat Apr 19 10:42:34 2014
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/mythbuntu.seed boot=casper quiet splash --
LiveMediaBuild: Mythbuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
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)