sudo apt-get install libopen-dev

The following packages have unmet dependencies:
 libopencv-dev : Depends: libopencv-objdetect-dev (= 2.3.1-7) but it is not going to be installed
                 Depends: libopencv-highgui-dev (= 2.3.1-7) but it is not going to be installed
                 Depends: libopencv-calib3d-dev (= 2.3.1-7) but it is not going to be installed
                 Depends: libopencv-features2d-dev (= 2.3.1-7) but it is not going to be installed
                 Depends: libopencv-legacy-dev (= 2.3.1-7) but it is not going to be installed
                 Depends: libopencv-contrib-dev (= 2.3.1-7) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

sudo apt-get autoclean

sudo apt-get autoremove

sudo apt-get -f install

sudo apt-get dist-upgrade

sudo apt-get install --reinstall libopen-dev