I attempted to install 11.1 on a 64-bit machine using the KDE 4 desktop. The main display screen failed. There is a bug report, which I will include below. I tried again with the Gnome interface and succeeded. So the problem is associated with KDE . KDE 3.5 and 4 ran fine on version 11.0 on this computer.

Here is the bug report:

Application: Plasma Workspace (plasma), signal SIGSEGV
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[Thread debugging using libthread_db enabled]
[New Thread 0x7f517af42950 (LWP 4317)]
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[KCrash handler]
#5 0x00007f51827447b0 in QGraphicsLayoutItem::setSizePolicy(QSizePolicy const&) () from /usr/lib64/libQtGui.so.4
#6 0x00007f5171339027 in ?? ()
from /usr/lib64/kde4/plasma_applet_systemtray.so
#7 0x00007f5187692352 in Plasma::Applet::flushPendingConstraintsEvents() ()
from /usr/lib64/libplasma.so.2
#8 0x00007f5183146da3 in QObject::event(QEvent*) ()
from /usr/lib64/libQtCore.so.4
#9 0x00007f51827482ab in QGraphicsWidget::event(QEvent*) ()
from /usr/lib64/libQtGui.so.4
#10 0x00007f51821ee1bd in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib64/libQtGui.so.4
#11 0x00007f51821f5f8a in QApplication::notify(QObject*, QEvent*) ()
from /usr/lib64/libQtGui.so.4
#12 0x00007f5185760bab in KApplication::notify(QObject*, QEvent*) ()
from /usr/lib64/libkdeui.so.5
#13 0x00007f5183138091 in QCoreApplication::notifyInternal(QObject*, QEvent*)
() from /usr/lib64/libQtCore.so.4
#14 0x00007f51831641c0 in ?? () from /usr/lib64/libQtCore.so.4
#15 0x00007f518316058d in ?? () from /usr/lib64/libQtCore.so.4
#16 0x00007f517e9f70db in g_main_context_dispatch ()
from /usr/lib64/libglib-2.0.so.0
#17 0x00007f517e9fa8ad in ?? () from /usr/lib64/libglib-2.0.so.0
#18 0x00007f517e9faa6b in g_main_context_iteration ()
from /usr/lib64/libglib-2.0.so.0
#19 0x00007f51831604ef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#20 0x00007f518227e97f in ?? () from /usr/lib64/libQtGui.so.4
#21 0x00007f51831369a2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#22 0x00007f5183136b2d in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#23 0x00007f518524fe2c in KIO::NetAccess::enter_loop() ()
from /usr/lib64/libkio.so.5
#24 0x00007f5185250015 in KIO::NetAccess::statInternal(KUrl const&, int, KIO::NetAccess::StatSide, QWidget*) () from /usr/lib64/libkio.so.5
#25 0x00007f5185250bee in KIO::NetAccess::stat(KUrl const&, KIO::UDSEntry&, QWidget*) () from /usr/lib64/libkio.so.5
#26 0x00007f5185250c7c in KIO::NetAccess::mostLocalUrl(KUrl const&, QWidget*)
() from /usr/lib64/libkio.so.5
#27 0x00007f517a53cdf8 in ?? () from /usr/lib64/kde4/plasma_applet_icon.so
#28 0x00007f517a53d565 in ?? () from /usr/lib64/kde4/plasma_applet_icon.so
#29 0x00007f51876b9789 in Plasma::Corona::loadLayout(QString const&) ()
from /usr/lib64/libplasma.so.2
#30 0x00007f51876b9d82 in Plasma::Corona::initializeLayout(QString const&) ()
from /usr/lib64/libplasma.so.2
#31 0x00007f51879d99d8 in ?? () from /usr/lib64/libkdeinit4_plasma.so
#32 0x00007f51879db4f1 in ?? () from /usr/lib64/libkdeinit4_plasma.so
#33 0x00007f51879db5cf in ?? () from /usr/lib64/libkdeinit4_plasma.so
#34 0x00007f51879ce6cc in kdemain () from /usr/lib64/libkdeinit4_plasma.so
#35 0x00007f517fda3586 in __libc_start_main () from /lib64/libc.so.6
#36 0x00000000004008d9 in _start ()