edoardo:~ sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
 python : Depends: python-minimal (= 2.7.8-1) but 2.7.9-1 is installed
          Depends: libpython-stdlib (= 2.7.8-1) but 2.7.9-1 is installed
 python-all : Depends: python (= 2.7.9-1) but 2.7.8-1 is installed
 python-all-dbg : Depends: python (= 2.7.9-1) but 2.7.8-1 is installed
 python-all-dev : Depends: python (= 2.7.9-1) but 2.7.8-1 is installed
 python-dbg : Depends: python (= 2.7.9-1) but 2.7.8-1 is installed
 python-dev : Depends: python (= 2.7.9-1) but 2.7.8-1 is installed
E: Unmet dependencies. Try using -f.