nepomukservicestub crashed with SIGSEGV in QHashData::detach_helper2()

Binary package hint: kdebase-runtime

it just wont let me install thing

ProblemType: Crash
DistroRelease: Ubuntu 10.04
Package: kdebase-runtime 4:4.4.2-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
Architecture: i386
Date: Sun Apr 18 13:55:06 2010
ExecutablePath: /usr/bin/nepomukservicestub
ProcCmdline: /usr/bin/nepomukservicestub nepomukstrigiservice
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
 LANGUAGE=
SegvAnalysis:
 Segfault happened at: 0xeda97c: mov 0x8(%edx),%ecx
 PC (0x00eda97c) ok
 source "0x8(%edx)" (0x89c9315d) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: kdebase-runtime
StacktraceTop:
 ?? () from /usr/lib/libsoprano.so.4
 QHashData::detach_helper2(void (*)(QHashData::Node*, void*), void (*)(QHashData::Node*), int, int) () from /usr/lib/libQtCore.so.4
 Soprano::Error::ErrorCache::clearError() const ()
 Soprano::Error::ErrorCache::setError(Soprano::Error::Error const&) const () from /usr/lib/libsoprano.so.4
 ?? () from /usr/lib/libsopranoclient.so.1
Title: nepomukservicestub crashed with SIGSEGV in QHashData::detach_helper2()
UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev sambashare tape video
XsessionErrors:
 (polkit-gnome-authentication-agent-1:7042): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (gnome-appearance-properties:7164): Gdk-CRITICAL **: gdk_display_sync: assertion `GDK_IS_DISPLAY (display)' failed
 (gnome-appearance-properties:7164): Gdk-CRITICAL **: gdk_display_sync: assertion `GDK_IS_DISPLAY (display)' failed