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I am using Kubuntu 20.04. This morning I have upgraded some packages and after their installation I was unable to logout.

This, I believe, is because of the nvidia package. I also couldn't find ksmverver for more information, and was asked to install it.

Normally when a xserver is upgraded it must be restarted, but it didn't and the taskbar didn't give any alerts to restart the machine or the xserver service.

Below, is a crash report of xserver:

Thread 1 (Thread 0x7fac75b3a840 (LWP 31635)):
[KCrash Handler]
#6  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#7  0x00007fac79853859 in __GI_abort () at abort.c:79
#8  0x00007fac79c86aad in QMessageLogger::fatal(char const*, ...) const () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fac7b5fe065 in QSGRenderLoop::handleContextCreationFailure(QQuickWindow*, bool) () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007fac7b5ff157 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007fac7b5ffa1d in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007fac7a27b9ad in QWindow::event(QEvent*) () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#13 0x00007fac7b681159 in QQuickWindow::event(QEvent*) () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x000055c60582b156 in ?? ()
#15 0x00007fac7a944a66 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007fac7a94e0f0 in QApplication::notify(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007fac79e8793a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007fac7a271de6 in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#19 0x00007fac7a272014 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#20 0x00007fac7a24c35b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#21 0x00007fac7571132e in ?? () from /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#22 0x00007fac77eccfbd in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fac77ecd240 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007fac77ecd2e3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007fac79edf565 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007fac79e864db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007fac79e8e246 in QCoreApplication::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x000055c6058267cc in ?? ()
#29 0x00007fac798550b3 in __libc_start_main (main=0x55c605826540, argc=1, argv=0x7ffe34119808, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe341197f8) at ../csu/libc-start.c:308
#30 0x000055c60582691e in _start ()
[Inferior 1 (process 31635) detached]

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