Comment # 12 on bug 1042448 from Chris Ward

I have just received an email from 'bugs.kde.org' (where I raised a matching
issue) ---
Christoph Feck <bugzilla_noreply@kde.org>

18:54 (9 minutes ago)

to tjcw
https://bugs.kde.org/show_bug.cgi?id=380478

Christoph Feck <cfeck@kde.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DOWNSTREAM
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Christoph Feck <cfeck@kde.org> ---
The D-Bus session is not initialized. If you are not using custom
startup-scripts (or modifications), please report this issue to the bug tracker
of your distribution.

Note, however, that KDM is unmaintained, and that your distribution provider
might recommend to use a different display manager (login manager) instead.