plasma workspace crashes on starting session

[Per Ångström]

I am not able to run KDE 4.4 in Lucid Lynx Alpha 1+: Plasma crashes after a few seconds. I can see the desktop wallpaper briefly, but then everything turns dark and the crash dialog comes up. I normally run Gnome, but I think I have installed enough KDE packages to be able to run it.

Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#5 0x00007fc7207bc877 in ?? () from /usr/lib/libplasma.so.3
#6 0x00007fc7207bda8a in ?? () from /usr/lib/libplasma.so.3
#7 0x00007fc720762086 in Plasma::Applet::flushPendingConstraintsEvents() () from /usr/lib/libplasma.so.3
#8 0x00007fc70980a41f in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#9 0x00007fc709809353 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#10 0x00007fc7097fcfb9 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#11 0x00007fc709819373 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0x00007fc7207620a4 in Plasma::Applet::flushPendingConstraintsEvents() () from /usr/lib/libplasma.so.3
#13 0x00007fc71cf9f895 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#14 0x00007fc71cfa2c98 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#15 0x00007fc727b29833 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#16 0x00007fc727b310cf in ?? () from /usr/lib/libQtCore.so.4
#17 0x00007fc727b264a3 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#18 0x00007fc726cbcf2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#19 0x00007fc726cc353d in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#20 0x00007fc7280599d6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#21 0x00007fc727b16abc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#22 0x00007fc727b437a2 in ?? () from /usr/lib/libQtCore.so.4
#23 0x00007fc727b40388 in ?? () from /usr/lib/libQtCore.so.4
#24 0x00007fc72315cd4e in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0x00007fc723160718 in ?? () from /lib/libglib-2.0.so.0
#26 0x00007fc723160840 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0x00007fc727b40053 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#28 0x00007fc726d6b3de in ?? () from /usr/lib/libQtGui.so.4
#29 0x00007fc727b153e2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0x00007fc727b157bc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#31 0x00007fc727b194fb in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#32 0x00007fc71cfa9d12 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#33 0x0000000000406fb8 in _start ()

ProblemType: Bug
Architecture: amd64
Date: Mon Dec 28 10:36:23 2009
DistroRelease: Ubuntu 10.04
Package: libplasma3 4:4.3.85-0ubuntu5
ProcVersionSignature: Ubuntu 2.6.32-9.13-generic
SourcePackage: kde4libs
Tags: lucid
Uname: Linux 2.6.32-9-generic x86_64

[Per Ångström (autark)]

Attaching standard and error output from `plasma-desktop`.