After I have upgraded from Kubuntu 12.10 to Kubuntu 13.04, my KDE session did not start. It had issues with bringing up dbus and asked be to call qdbus, by hand.
But, when I do:
When I typed qdbus in the terminal, it looks up for /usr/lib/x86_64-linux-gnu/qt4/bin/qdbus but it cannot find it.
I have figured out what the issue is when I found the /usr/lib/i386-linux-gnu/qt4/bin/qdbus file.
On my 64 bit Kubuntu, I have qdbus for 32 bit installed, but I need the version for 64 bit systems.
To fix this, just install qdbus:
$ sudo apt-get install qdbus
The 32 bit qdbus was deleted, the 64 bit qdbus was installed, KDE run successfully and everybody was happy.