Version:           Dolphin 1.2.1 (Kubuntu KDE 4.2.2)  (using KDE 4.2.2)
Installed from:    Ubuntu Packages

Dolphin 1.2.1 at Kde 4.2.2 (Kubuntu) suddenly crashes at startup.

Here it's the backtrace:

Thread 2 (Thread 0xb4760b90 (LWP 5735)):
#0  0xb80f0430 in __kernel_vsyscall ()
#1  0xb6715f36 in nanosleep () from /lib/tls/i686/cmov/libc.so.6
#2  0xb6715d4e in sleep () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7939262 in ?? () from /usr/lib/libkdeui.so.5
#4  0xb7939c24 in KCrash::defaultCrashHandler () from /usr/lib/libkdeui.so.5
#5  <signal handler called>
#6  0xb694b31d in QMutex::lock () from /usr/lib/libQtCore.so.4
#7  0xb7b354a0 in ?? () from /usr/lib/libQtNetwork.so.4
#8  0xb7b426d7 in QAbstractSocket::setSocketDescriptor () from /usr/lib/libQtNetwork.so.4
#9  0xb7b4fa39 in ?? () from /usr/lib/libQtNetwork.so.4
#10 0xb7b50466 in QLocalSocket::connectToServer () from /usr/lib/libQtNetwork.so.4
#11 0xb63a76ae in ?? () from /usr/lib/libsopranoclient.so.1
#12 0xb63a8993 in ?? () from /usr/lib/libsopranoclient.so.1
#13 0xb63a8b02 in ?? () from /usr/lib/libsopranoclient.so.1
#14 0xb63abc79 in ?? () from /usr/lib/libsopranoclient.so.1
#15 0xb63ac8a6 in ?? () from /usr/lib/libsopranoclient.so.1
#16 0xb7c2ede3 in ?? () from /usr/lib/libsoprano.so.4
#17 0xb7c8e16b in ?? () from /usr/lib/libsoprano.so.4
#18 0xb7cf8455 in ?? () from /usr/lib/libnepomuk.so.4
#19 0xb7cf2818 in ?? () from /usr/lib/libnepomuk.so.4
#20 0xb7cf3068 in ?? () from /usr/lib/libnepomuk.so.4
#21 0xb7d0dbb7 in Nepomuk::Resource::property () from /usr/lib/libnepomuk.so.4
#22 0xb7d0ef11 in Nepomuk::Resource::rating () from /usr/lib/libnepomuk.so.4
#23 0x08086355 in _start ()

Thread 1 (Thread 0xb5f846c0 (LWP 5717)):
#0  0xb80f0430 in __kernel_vsyscall ()
#1  0xb6752df1 in select () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7b4c2f6 in ?? () from /usr/lib/libQtNetwork.so.4
#3  0xb7b36fc0 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb7b46102 in QAbstractSocket::waitForReadyRead () from /usr/lib/libQtNetwork.so.4
#5  0xb7b4e0cd in QLocalSocket::waitForReadyRead () from /usr/lib/libQtNetwork.so.4
#6  0xb63a8b48 in ?? () from /usr/lib/libsopranoclient.so.1
#7  0xb63ab6b3 in ?? () from /usr/lib/libsopranoclient.so.1
#8  0xb7cfba52 in ?? () from /usr/lib/libnepomuk.so.4
#9  0xb66a7d89 in exit () from /lib/tls/i686/cmov/libc.so.6
#10 0xb668f68d in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#11 0x08062391 in _start ()
#0  0xb80f0430 in __kernel_vsyscall ()