> root:~# sudo apt-get install postfix
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:
 apache2.2-common : Depends: procps but it is not going to be installed
 bind9 : Depends: netbase but it is not going to be installed
 dmsetup : Depends: util-linux (> 2.16) but it is not going to be installed
 e2fsprogs : PreDepends: util-linux (>= 2.15~rc1-1) but it is not going to be installed
 ftp : Depends: netbase but it is not going to be installed
 libwww-perl : Depends: netbase but it is not going to be installed
 munin-node : Depends: procps but it is not going to be installed
 ntp : Depends: netbase but it is not going to be installed
 ntpdate : Depends: netbase but it is not going to be installed
           Recommends: lockfile-progs but it is not going to be installed
 openssh-server : Depends: procps but it is not going to be installed
                  Recommends: xauth but it is not going to be installed
 postfix : Depends: netbase but it is not going to be installed
 postgresql-common : Depends: procps but it is not going to be installed
 proftpd-basic : Depends: netbase (>= 4.13) but it is not going to be installed
 telnet : Depends: netbase but it is not going to be installed
 udev : Depends: util-linux (>= 2.16) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).