New upgrade of Kubuntu 15.04 and desktop widget says : "Could not start process Unable to create io-slave: klauncher said : Unknown protocol 'file'." and can't list any files. Any dialogue that would list files (like Kate) can't. Reproducible: Always Actual Results: http://postimg.org/image/57aqdam4j/ http://postimg.org/image/g7p0dw4fj/
Maybe related https://forum.kde.org/viewtopic.php?f=289&t=125341
Must of been something wrong with the 15.04 upgrade as moving ~/.kde to ~/.kde old and removing all from ~/.cache resolve most of the issues.