kde4-config: symbol lookup error: /usr/lib/libQtDBus.so.4: undefined symbol: _ZN14QObjectPrivate15checkWindowRoleEv

[Tomasz 'Trog' Welman]

Hi, I've just upgraded the system the usual way, the upgrade manager from KDE. After it finished, nothing was actually working, so I restarted and no I have no use of KDE - it just doesn't work. :-( :-(
The thing is simple, someone compiled kde with qt version that is not in the repo I think. At least this looks that way.

I have:
ii libqt4-dbus 4.5.3really4.5.2-0ubuntu1 Qt 4 D-Bus module

and:
ii kdelibs5 4:4.3.2-0ubuntu7.2 core libraries for all KDE 4 applications
ii kdelibs5-data 4:4.3.2-0ubuntu7.2 core shared data for all KDE 4 applications

Can anyone help? I'm unable to work under gnome. :-(

ProblemType: Bug
Architecture: i386
Date: Thu Mar 25 15:35:03 2010
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: symap_custom symev_custom
Package: kdelibs5 4:4.3.2-0ubuntu7.2
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
SourcePackage: kde4libs
Uname: Linux 2.6.31-custom i686

[Jonathan Thomas (echidnaman)]

Could you paste the output of "ldd /usr/bin/kde4-config" please?

[Tomasz 'Trog' Welman (tomasz-welman)]

Here you go:
# ldd /usr/bin/kde4-config
 linux-gate.so.1 => (0xb7ff1000)
 libQtCore.so.4 => /opt/ibm/MobilityClient/lib/libQtCore.so.4 (0xb7e47000)
 libkdecore.so.5 => /usr/lib/libkdecore.so.5 (0xb7bff000)
 libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7ab9000)
 libz.so.1 => /lib/libz.so.1 (0xb7aa3000)
 libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0xb7a8a000)
 libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0xb7a86000)
 libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0xb79cc000)
 libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0xb79a5000)
 libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb7987000)
 libQtNetwork.so.4 => /opt/ibm/MobilityClient/lib/libQtNetwork.so.4 (0xb7923000)
 libQtDBus.so.4 => /usr/lib/libQtDBus.so.4 (0xb78b1000)
 libbz2.so.1.0 => /lib/libbz2.so.1.0 (0xb789f000)
 liblzma.so.0 => /usr/lib/liblzma.so.0 (0xb787a000)
 libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xb7788000)
 /lib/ld-linux.so.2 (0xb7ff2000)
 libQtXml.so.4 => /opt/ibm/MobilityClient/lib/libQtXml.so.4 (0xb773f000)

so... I see the problem, some of the libs are taken from /opt/ibm/MobilityClient/lib, which is of course not good.
I'll try to remove this MobilityClient and see what happens.

[Tomasz 'Trog' Welman (tomasz-welman)]

This doesn't help if I install MobilityClient again, but removing the file /etc/ld.so.conf.d/lmc.conf helped. Now kde4-config is linked to the proper libraries.

(lmc.conf just tells ldconfig to load libs from /opt/ibm/MobilityClient/lib)

[Jonathan Thomas (echidnaman)]

Yeah, I figured it would be something like that. Unfortunately, there's not much we can do about it, since we don't have any Mobility packages in the archive. (They're third-party and thus unsupportable by us)

At least you figured out a workaround. :)