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Reading package lists... Done

Building dependency tree      

Reading state information... Done

mdm is already the newest version.

You might want to run 'apt-get -f install' to correct these:

The following packages have unmet dependencies:

 gnome-core : Depends: gdm (>= 3.0) but it is not going to be installed

E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).