Ubiquity crashed while trying to install 12.04 in VirtualBox on an iMac

This happened after I had finished inputing all my data and selecting my timezone. The installer had been running for about a minute before it crashed, though I couldn't say execatly how far in it was since I was distracted at the time.

At the time I was running a second instance of VirtualBox with 11.10, which had finsihed installing just before I started the 12.04 installation. When the crash occured, I was in the process of applying the updates to 11.10 and had just installed the proprietary virtualisation drivers (not the VirtualBox guest additions, hwich hadn't been installed at the time, but some drivers that were available through Ubuntu's driver manager).

The computer is a 2011 iMac.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.9.4
ProcVersionSignature: Ubuntu 3.2.0-1.3-generic 3.2.0-rc2
Uname: Linux 3.2.0-1-generic i686
ApportVersion: 1.90-0ubuntu1
Architecture: i386
CasperVersion: 1.291
Date: Sat Nov 26 10:29:54 2011
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20111125)
ProcEnviron:
 LANGUAGE=en_GB.UTF-8
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)