title: Dependency failure while installing libboost-all-dev on ubuntu core 14.04
body: <p>Does someone know why I get the following after "sudo apt-get install libboost-all-dev":</p>
  
  <pre><code>Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:
  
  The following packages have unmet dependencies:
   libboost-all-dev : Depends: libboost-context-dev but it is not going to be installed
                      Depends: libboost-coroutine-dev but it is not going to be installed
                      Depends: libboost-exception-dev but it is not going to be installed
                      Depends: libboost-graph-dev but it is not going to be installed
                      Depends: libboost-graph-parallel-dev but it is not going to be installed
                      Depends: libboost-locale-dev but it is not going to be installed
                      Depends: libboost-log-dev but it is not going to be installed
                      Depends: libboost-math-dev but it is not going to be installed
                      Depends: libboost-mpi-dev but it is not going to be installed
                      Depends: libboost-mpi-python-dev but it is not going to be installed
                      Depends: libboost-random-dev but it is not going to be installed
                      Depends: libboost-signals-dev but it is not going to be installed
                      Depends: libboost-timer-dev but it is not going to be installed
                      Depends: libboost-wave-dev but it is not going to be installed
  E: Unable to correct problems, you have held broken packages.
  </code></pre>
  
  <p>What can I do to change it?</p>