ubiquity crash with segfault

[Diska]

Binary package hint: ubiquity

i'm trying to install natty last daily build ( 20110124) on virtulabox but ubiquity crash with the following error after after user data ( username, password ) are entered

[ 579.855219] ubiquity[8070]: segfault at bbadbeef ip 00007f641fddb5c5 sp 00007fff82d49d10 error 6 in libwebkitgtk-1.0.so.0.5.2[7f641ec3d000+14bc000]

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: ubiquity 2.5.11
ProcVersionSignature: Ubuntu 2.6.37-12.26-generic 2.6.37
Uname: Linux 2.6.37-12-generic x86_64
Architecture: amd64
Date: Mon Jan 24 18:44:41 2011
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110124.2)
ProcEnviron:
 LANGUAGE=en_US.UTF-8:en
 LANG=en_US.UTF-8
 LC_MESSAGES=en_AG.utf8
 SHELL=/bin/bash
SourcePackage: ubiquity

[Launchpad Janitor (janitor)]

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