gcc : Depends: cpp(>= 4:5.3.1-ubuntu1) but it is not going to be installed.
     Depends: gcc-5 (>= 5.3.1-3~) but is not going to be installed.

gcc-5: Depends: cpp-5 (= 5.3.1-14ubuntu2.1) but it is not going to be installed
       Depends: gcc-5-base (= 5.3.1-14ubuntu2.1) but 5.4.0~6ubuntu1~16.04.1 is to be installed
       Depends: libcc1-0 (>= 5.3.1-14ubuntu2.1) but is not going to be installed
       Depends: libgcc-5-dev (= 5.3.1-14ubuntu2.1) but is not going to be installed