Version: One packaged with KDE 4.4 Beta 1 (using Devel) OS: Linux Installed from: Compiled sources After installing the KDE 4.4 Beta 1 packages on Kubuntu, I always get the following error in notifications when I try to enable Strigi: "Nepomuk Semantic Desktop needs the Virtuoso RDF server to store its data. Installing the Virtuoso Soprano plugin is mandatory for using nepomuk." I checked and I have all packages with Virtuoso or Soprano in their names installed, except the CLI bindings, -dbg and -doc packages. When I look in the system monitor, sopranod isn't running, however I can start it from the commandline without error, but I still get the same thing when I try to start Strigi. I'm on: Kubuntu Karmic AMD64 KDE 4.4 Beta 1 (Kubuntu packages)
You need to install the Virtuoso server itself. It is very well possible that no packages exist yet which means that you will have to compile it yourself. For KDE 4.4 final packages will be available. As a sidenote: sopranod is not used by Nepomuk.