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Ok I could solve this problem finally. libopencv-dev was causing all the troubles. Somehow libopencv-dev was installed by apt-get without caring about some missing dependencies. I deleted it, and tried to compile OpenCv by myself but got some errors about some static libraries (.a) that cannot be linked and asked me to recompile with -fPIC. So I followed this tutorial to compile OpenCV

http://www.ozbotz.org/opencv-installation/

It worked and I have the latest stable OpenCV version now. My face recognition is also working again like it did before on Hydro with Ubuntu 12.04.

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