If you’ve tried to login to your KDE desktop but only received an error message saying “Could not start D-Bus. Can you call qdbus?“, like I did after upgrading my system to 13.10, then this guide should help you. While this login failure may look ominous, it’s actually easily remedied by simply installing the package qdbus. If you have other login options than KDE, like Ubuntu/Unity, Gnome or another desktop environment, log into that and in a terminal run:
sudo apt-get install qdbus
You should be able to log into KDE after logging out of the desktop you were in (if not, all should be well after a reboot).
If you only have Kubuntu‘s KDE as a login option, then use Ctrl+Alt+F1 to go to a different TTY (teletype terminal), where you’ll be prompted to enter your username, then password, and at the command prompt you end up at, run the above command. Once qdbus is installed, enter sudo shutdown -r now (or sudo reboot) to reboot your computer, and you should now be able to reach your KDE desktop.
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