root@server:~# apt-get install xfce4
Reading package lists... Done
Building dependency tree... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 webmin : Depends: libnet-ssleay-perl but it is not going to be installed
          Depends: libauthen-pam-perl but it is not going to be installed
          Depends: libio-pty-perl but it is not going to be installed
          Depends: apt-show-versions but it is not going to be installed
 xfce4 : Depends: xfwm4 (>= 4.8.0) but it is not going to be installed
         Depends: xfconf (>= 4.8.0) but it is not going to be installed
         Depends: xfce4-settings (>= 4.8.0) but it is not going to be installed
         Depends: xfce4-panel (>= 4.8.0) but it is not going to be installed
         Depends: xfdesktop4 (>= 4.8.0) but it is not going to be installed
         Depends: thunar (>= 1.2.0) but it is not going to be installed
         Depends: xfce4-utils (>= 4.8.0) but it is not going to be installed
         Depends: gtk2-engines-xfce (>= 2.8.0) but it is not going to be installed
         Depends: xfce4-session (>= 4.8.0) but it is not going to be installed
         Depends: xfce4-appfinder (>= 4.8.0) but it is not going to be installed
         Depends: xfce4-mixer (>= 4.8.0) but it is not going to be installed
         Depends: orage (>= 4.8.0) but it is not going to be installed
         Recommends: xorg but it is not going to be installed
         Recommends: desktop-base (>= 5.0.4) but it is not going to be installed
         Recommends: thunar-volman (>= 0.6.0) but it is not going to be installed
         Recommends: tango-icon-theme (>= 0.8.90) but it is not going to be installed
         Recommends: xfce4-notifyd but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).