The following packages have unmet dependencies:
 python-pyopencl : Depends: opencl-icd but it is not installable
                   Depends: python-pyopencl-headers (= 2012.1-1ubuntu1) but it is not going to be installed
                   Recommends: python-pyopencl-doc but it is not going to be installed
E: Unable to correct problems, you have held broken packages.