Q: Plasma 5 on Fedora giving "Could not start d-bus. Can you call qdbus?" I cannot start Plasma 5 in Fedora 20. I have installed using the following method:
yum install kf5-\*
dnf copr enable dvratil/plasma-5
yum install plasma-5

Everything went fine and plasmashell will run. However, when I try to log into a Plasma shell from the display manager, I get Could not start d-bus. Can you call qdbus?. I can run qdbus just fine.
I have seen a few bug reports in other distros that look similar, but don't seem applicable. What causes this?
Additional information: I have discovered that the source of the error above was that the startkde.sh script in /usr/bin/ was not finding the path for qdbus. It uses the tool qtpaths to locate this path. For some reason qtpath, which is provided by qt5-qttools, was not present. Once I installed qt5-qttools, the previous error is passed. However, something is still awry. I can open programs, but there is no menu or background. I'm am now under the assumption that there is some unlisted dependency, of which both qt5-qttools and whatever allows the rest of Plasma to be loaded are parts.

A: I fixed it by running yum install qt5-qttools. If it does not work for you, please run /usr/bin/startkde in a tty and post the error output.
