I was able to get set up tonight, so thought I would try a quite recent build. Kstars crash, as others have reported. Here is the backtrace:

Core was generated by `kstars'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  std::__uniq_ptr_impl<ISD::CCDChip, std::default_delete<ISD::CCDChip> >::_M_ptr (this=0x98) at /usr/include/c++/10/bits/unique_ptr.h:173
173          pointer    _M_ptr() const { return std::get<0>(_M_t); }
[Current thread is 1 (Thread 0x7f16c8062a00 (LWP 4357))]
(gdb) bt
#0  std::__uniq_ptr_impl<ISD::CCDChip, std::default_delete<ISD::CCDChip> >::_M_ptr() const (this=0x98) at /usr/include/c++/10/bits/unique_ptr.h:173
#1  std::unique_ptr<ISD::CCDChip, std::default_delete<ISD::CCDChip> >::get() const (this=0x98) at /usr/include/c++/10/bits/unique_ptr.h:422
#2  ISD::CCD::getChip(ISD::CCDChip::ChipType) (this=0x0, cType=cType@entry=ISD::CCDChip::PRIMARY_CCD) at /usr/src/debug/kstars-3.5.3.git-20210412132123.fc33.x86_64/kstars/indi/indiccd.cpp:1918
#3  0x00005633127ad77c in Ekos::Focus::stop(bool) (this=0x563318241290, aborted=<optimized out>) at /usr/src/debug/kstars-3.5.3.git-20210412132123.fc33.x86_64/kstars/ekos/focus/focus.cpp:931
#4  0x00005633127b6035 in Ekos::Focus::completeFocusProcedure(bool) (this=0x563318241290, success=<optimized out>) at /usr/src/debug/kstars-3.5.3.git-20210412132123.fc33.x86_64/kstars/ekos/focus/focus.cpp:1483
#5  0x00007f16cce96386 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7fff009a7cf0, r=0x563318241290, this=0x5633182a2520) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#6  doActivate<false>(QObject*, int, void**) (sender=0x56331824fdd0, signal_index=9, argv=argv@entry=0x7fff009a7cf0) at kernel/qobject.cpp:3886
#7  0x00007f16cce909a8 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x56331824fdd0, m=m@entry=0x7f16cde076a0 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fff009a7cf0)
    at kernel/qobject.cpp:3946
#8  0x00007f16cd9eb316 in QAbstractButton::clicked(bool) (this=this@entry=0x56331824fdd0, _t1=<optimized out>) at .moc/moc_qabstractbutton.cpp:308
#9  0x00007f16cd9ebcde in QAbstractButtonPrivate::emitClicked() (this=this@entry=0x563318250960) at widgets/qabstractbutton.cpp:415
#10 0x00007f16cd9ed673 in QAbstractButtonPrivate::click() (this=this@entry=0x563318250960) at widgets/qabstractbutton.cpp:408
#11 0x00007f16cd9ed855 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) (this=0x56331824fdd0, e=0x7fff009a82b0) at widgets/qabstractbutton.cpp:1044
#12 0x00007f16cd93cb1e in QWidget::event(QEvent*) (this=0x56331824fdd0, event=0x7fff009a82b0) at kernel/qwidget.cpp:9019
#13 0x00007f16cd8fbec3 in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x56331824fdd0, e=0x7fff009a82b0) at kernel/qapplication.cpp:3632
#14 0x00007f16cd902eeb in QApplication::notify(QObject*, QEvent*) () at kernel/qapplication.cpp:3076
#15 0x00007f16cce66bd8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x56331824fdd0, event=0x7fff009a82b0) at kernel/qcoreapplication.cpp:1063
#16 0x00007f16cd901efa in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool)
    (receiver=receiver@entry=0x56331824fdd0, event=event@entry=0x7fff009a82b0, alienWidget=alienWidget@entry=0x56331824fdd0, nativeWidget=0x5633170265d0, buttonDown=buttonDown@entry=0x7f16cde3a330 <qt_button_down>, lastMouseReceiver=..., spontaneous=true, onlyDispatchEnterLeave=false) at kernel/qapplication.cpp:2614
#17 0x00007f16cd955375 in QWidgetWindow::handleMouseEvent(QMouseEvent*) (this=0x5633174f82f0, event=0x7fff009a8560) at kernel/qwidgetwindow.cpp:683
#18 0x00007f16cd9586be in QWidgetWindow::event(QEvent*) (this=0x5633174f82f0, event=0x7fff009a8560) at kernel/qwidgetwindow.cpp:300
#19 0x00007f16cd8fbec3 in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x5633174f82f0, e=0x7fff009a8560) at kernel/qapplication.cpp:3632
#20 0x00007f16cce66bd8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x5633174f82f0, event=0x7fff009a8560) at kernel/qcoreapplication.cpp:1063
#21 0x00007f16cd2a2143 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at kernel/qguiapplication.cpp:2275
#22 0x00007f16cd2838cc in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (flags=flags@entry=...) at kernel/qwindowsysteminterface.cpp:1169
#23 0x00007f16baa3947e in xcbSourceDispatch(GSource*, GSourceFunc, gpointer) (source=source@entry=0x563313c00750) at qxcbeventdispatcher.cpp:105
#24 0x00007f16cb9dba9f in g_main_dispatch (context=0x7f16b4005000) at ../glib/gmain.c:3325
#25 g_main_context_dispatch (context=0x7f16b4005000) at ../glib/gmain.c:4043
#26 0x00007f16cba2da98 in g_main_context_iterate.constprop.0 (context=context@entry=0x7f16b4005000, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4119
#27 0x00007f16cb9d8e73 in g_main_context_iteration (context=0x7f16b4005000, may_block=1) at ../glib/gmain.c:4184
#28 0x00007f16cceb36f3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x563313ad2160, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#29 0x00007f16cce6557b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fff009a8890, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#30 0x00007f16cce6d1b4 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#31 0x000056331239c082 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kstars-3.5.3.git-20210412132123.fc33.x86_64/kstars/main.cpp:346



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