You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 r-cran-class : Depends: r-cran-mass but it is not going to be installed
 r-cran-kernsmooth : Depends: r-cran-mass but it is not going to be installed
 r-recommended : Depends: r-cran-mass but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 r-cran-class : Depends: r-cran-mass but it is not going to be installed
 r-cran-kernsmooth : Depends: r-cran-mass but it is not going to be installed
 r-recommended : Depends: r-cran-mass but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).