This isn't fixed in Karmic. Here is the stacktrace of the crash when calling 
"service network-manager restart":
Application: KNetworkManager (knetworkmanager), signal: Segmentation fault
[KCrash Handler]
#5  0x00007fcc82939c8a in Knm::Activatable::deviceUni() const () from 
/usr/lib/libknminternals.so.4
#6  0x00007fcc82700165 in ?? () from /usr/lib/libknmservice.so.4
#7  0x00007fcc827002b3 in ?? () from /usr/lib/libknmservice.so.4
#8  0x00007fcc82700550 in ?? () from /usr/lib/libknmservice.so.4
#9  0x00007fcc8270072c in SortedActivatableList::handleAdd(Knm::Activatable*) 
() from /usr/lib/libknmservice.so.4
#10 0x00007fcc826f006b in 
ActivatableList::addActivatableInternal(Knm::Activatable*) () from 
/usr/lib/libknmservice.so.4
#11 0x00007fcc826f35dd in 
WirelessNetworkInterfaceActivatableProvider::handleAdd(Knm::Connection*) () 
from /usr/lib/libknmservice.so.4
#12 0x00007fcc826f1490 in NetworkInterfaceActivatableProvider::init() () from 
/usr/lib/libknmservice.so.4
#13 0x00007fcc826f07d8 in 
NetworkInterfaceMonitor::networkInterfaceAdded(QString const&) () from 
/usr/lib/libknmservice.so.4
#14 0x00007fcc826ea1fd in 
NetworkInterfaceMonitor::qt_metacall(QMetaObject::Call, int, void**) () from 
/usr/lib/libknmservice.so.4
#15 0x00007fcc81150ddc in QMetaObject::activate(QObject*, int, int, void**) () 
from /usr/lib/libQtCore.so.4
#16 0x00007fcc8226c2c5 in 
Solid::Control::NetworkManager::Notifier::networkInterfaceAdded(QString const&) 
() from /usr/lib/libsolidcontrol.so.4
#17 0x00007fcc8226cc7c in ?? () from /usr/lib/libsolidcontrol.so.4
#18 0x00007fcc81150ddc in QMetaObject::activate(QObject*, int, int, void**) () 
from /usr/lib/libQtCore.so.4
#19 0x00007fcc77fdf9c5 in NMNetworkManager::networkInterfaceAdded(QString 
const&) () from /usr/lib/kde4/solid_networkmanager07.so
#20 0x00007fcc77fe0d84 in NMNetworkManager::deviceAdded(QDBusObjectPath const&) 
() from /usr/lib/kde4/solid_networkmanager07.so
#21 0x00007fcc77fe3c39 in NMNetworkManager::qt_metacall(QMetaObject::Call, int, 
void**) () from /usr/lib/kde4/solid_networkmanager07.so
#22 0x00007fcc81150ddc in QMetaObject::activate(QObject*, int, int, void**) () 
from /usr/lib/libQtCore.so.4
#23 0x00007fcc77fef282 in ?? () from /usr/lib/kde4/solid_networkmanager07.so
#24 0x00007fcc77fef6ad in ?? () from /usr/lib/kde4/solid_networkmanager07.so
#25 0x00007fcc81452ad4 in ?? () from /usr/lib/libQtDBus.so.4
#26 0x00007fcc81459def in ?? () from /usr/lib/libQtDBus.so.4
#27 0x00007fcc8114b0f9 in QObject::event(QEvent*) () from 
/usr/lib/libQtCore.so.4
#28 0x00007fcc8183fefc in QApplicationPrivate::notify_helper(QObject*, QEvent*) 
() from /usr/lib/libQtGui.so.4
#29 0x00007fcc818471ce in QApplication::notify(QObject*, QEvent*) () from 
/usr/lib/libQtGui.so.4
#30 0x00007fcc82f8aab6 in KApplication::notify(QObject*, QEvent*) () from 
/usr/lib/libkdeui.so.5
#31 0x00007fcc8113bc2c in QCoreApplication::notifyInternal(QObject*, QEvent*) 
() from /usr/lib/libQtCore.so.4
#32 0x00007fcc8113c80a in QCoreApplicationPrivate::sendPostedEvents(QObject*, 
int, QThreadData*) () from /usr/lib/libQtCore.so.4
#33 0x00007fcc81164533 in ?? () from /usr/lib/libQtCore.so.4
#34 0x00007fcc7d0bbbbe in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#35 0x00007fcc7d0bf588 in ?? () from /lib/libglib-2.0.so.0
#36 0x00007fcc7d0bf6b0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#37 0x00007fcc811641a6 in 
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () 
from /usr/lib/libQtCore.so.4
#38 0x00007fcc818d44be in ?? () from /usr/lib/libQtGui.so.4
#39 0x00007fcc8113a532 in 
QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from 
/usr/lib/libQtCore.so.4
#40 0x00007fcc8113a904 in 
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from 
/usr/lib/libQtCore.so.4
#41 0x00007fcc8113cab9 in QCoreApplication::exec() () from 
/usr/lib/libQtCore.so.4
#42 0x000000000040d12f in _start ()

-- 
RFE: knetworkmanager should recover when NetworkManager restarts
https://bugs.launchpad.net/bugs/123811
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Bugs, which is subscribed to knetworkmanager in ubuntu.

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