plasma crashed with SIGSEGV

[Fab]

Binary package hint: kdebase-workspace

when i run adept and wait for fetching packages list the plasma was crasshed. I've no more details.
I was testing kubuntu 9.04 beta 3 on a virtual box machine

ProblemType: Crash
Architecture: i386
Disassembly: 0xb80c0422:
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/plasma
Package: kdebase-workspace-bin 4:4.2.0-0ubuntu1
ProcCmdline: plasma --nocrashhandler
ProcEnviron:
 LANGUAGE=
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: kdebase-workspace
Stacktrace: #0 0xb80c0422 in ?? ()
StacktraceTop: ?? ()
ThreadStacktrace:

Title: plasma crashed with SIGSEGV
Uname: Linux 2.6.28-6-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:?? ()

[Apport retracing service (apport)]

Thank you for your report!

However, processing it in order to get sufficient information for the
developers failed (it does not generate an useful symbolic stack trace). This
might be caused by some outdated packages which were installed on your system
at the time of the report:

libgl1-mesa-glx: installed version 7.3~rc3-1ubuntu2, latest version: 7.3-1ubuntu1
libglu1-mesa: installed version 7.3~rc3-1ubuntu2, latest version: 7.3-1ubuntu1
phonon-backend-gstreamer: installed version None, latest version: 4:4.3.0-0ubuntu1
libxine1-plugins: installed version None, latest version: 1.1.16.1-2ubuntu1
libdrm2: installed version 2.4.4-0ubuntu2, latest version: 2.4.4-0ubuntu4
x11-common: installed version 1:7.4~5ubuntu10, latest version: 1:7.4~5ubuntu11

Please upgrade your system to the latest package versions. If you still
encounter the crash, please file a new report.

Thank you for your understanding, and sorry for the inconvenience!