Ubuntu natty won't install. Installation crashes (amd64 / virtualbox)

[bugmenot]

Binary package hint: ubiquity

When trying to install, installation crashes after entering all required information, or perhaps when it's finished installing,can't really figure out when.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: ubiquity 2.5.14
ProcVersionSignature: Ubuntu 2.6.38-2.29-generic 2.6.38-rc3
Uname: Linux 2.6.38-2-generic x86_64
Architecture: amd64
Date: Wed Feb 9 19:46:45 2011
ExecutablePath: /usr/share/ubiquity/plugininstall.py
InterpreterPath: /usr/bin/python2.7
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110209)
ProcCmdline: /usr/bin/python /usr/share/ubiquity/plugininstall.py
ProcEnviron:
 LANGUAGE=
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 LC_COLLATE=C
PythonArgs: ['/usr/share/ubiquity/plugininstall.py']
SourcePackage: ubiquity
Title: plugininstall.py crashed with IOError in command(): [Errno 32] Broken pipe
UserGroups: