Bug 342025

Please add the backtrace for the crash. For more information, please see https://techbase.kde.org/Development/Tutorials/Debugging/How_to_create_useful_crash_reports

Application: muon-updater (2.2.0)
KDE Platform Version: 4.13.3
Qt Version: 4.8.6
Operating System: Linux 3.13.0-43-generic x86_64
Distribution: Ubuntu 14.04.1 LTS

-- Backtrace:
Application: Muon beheerder voor bijwerken (muon-updater), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f38e9b6c7c0 (LWP 2456))]

Thread 2 (Thread 0x7f38d5d18700 (LWP 2458)):
#0  0x00007f38e71c3bad in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f38e408ffe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f38e40900ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f38e794a7be in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4  0x00007f38e791c0af in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5  0x00007f38e791c3a5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f38e7818c5f in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007f38e78fd823 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8  0x00007f38e781b32f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007f38e456f182 in start_thread (arg=0x7f38d5d18700) at pthread_create.c:312
#10 0x00007f38e71d0efd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f38e9b6c7c0 (LWP 2456)):
[KCrash Handler]
#5  0x00007f38ced18bca in pkgDepCache::Update(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#6  0x00007f38ced1910c in pkgDepCache::Init(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#7  0x00007f38ced47050 in pkgCacheFile::BuildDepCache(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#8  0x00007f38ced470b2 in pkgCacheFile::Open(OpProgress*, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#9  0x00007f38cf5356e3 in QApt::Backend::reloadCache() () from /usr/lib/libqapt.so.2
#10 0x00007f38cf5364de in QApt::Backend::init() () from /usr/lib/libqapt.so.2
#11 0x00007f38cf30f5cb in QAptActions::setBackend(QApt::Backend*) () from /usr/lib/libmuonapt.so
#12 0x00007f38cfddbf91 in ApplicationBackend::initBackend() () from /usr/lib/kde4/muon-appsbackend.so
#13 0x00007f38cfddb045 in ?? () from /usr/lib/kde4/muon-appsbackend.so
#14 0x00007f38e793187a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#15 0x00007f38e793a70a in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#16 0x00007f38e7935a31 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#17 0x00007f38e830fe2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#18 0x00007f38e83164a0 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#19 0x00007f38e901ad1a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#20 0x00007f38e791d4dd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#21 0x00007f38e794d323 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#22 0x00007f38e794a5f1 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#23 0x00007f38e408fe04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f38e4090048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f38e40900ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f38e794a7a1 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#27 0x00007f38e83b1bb6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#28 0x00007f38e791c0af in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#29 0x00007f38e791c3a5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#30 0x00007f38e7921b79 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#31 0x000000000040ce11 in ?? ()
#32 0x00007f38e70f7ec5 in __libc_start_main (main=0x40ca30, argc=5, argv=0x7fff46148e38, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff46148e28) at libc-start.c:287
#33 0x000000000040ce84 in _start ()

Thanks for the update, reassigning.

That crash appears to be deep in apt, so most likely installing the nvidia driver somehow screwed up apt itself, which is entirely weird :O

Should it be reproducible by installing the nvidia driver I'd urge you to report a bug against apt with this command:

ubuntu-bug apt

Even "apt-get check" results in a segmentation fault.

Triggered by an old question-and-answer on stackexchange, I tried running "apt-get clean".
After that, no crash happened anymore. Problem solved.