The following packages have unmet dependencies:
 python-dev : Depends: python (= 2.7.11-1) but 2.7.12-1 is to be installed
 python-setuptools : Depends: python-pkg-resources (= 20.7.0-1) but it is not going to be installed
                     Depends: python:any (< 2.8)
                     Depends: python:any (>= 2.7.5-5~)
E: Unable to correct problems, you have held broken packages.