staging:/etc/apt# apt-get 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:
 dpkg-dev : Depends: base-files (>= 5.0.0) but 5lenny11 is installed
            Recommends: fakeroot but it is not installed
            Recommends: libalgorithm-merge-perl but it is not installed
E: Unmet dependencies. Try using -f.