install python-uncertainities libcfitsio2 contact-lookup-applet python-imaging-doc xfce4 Reading package lists... Building dependency tree... Reading state information... Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: contact-lookup-applet : Depends: libglade2-0 (>= 1:2.5.1) but it is not going to be installed Depends: libgnomeui-0 (>= 2.13.0) but it is not going to be installed Depends: libgtk2.0-0 (>= 2.8.0) but it is not going to be installed Depends: libpanel-applet2-0 (>= 2.14.3) but it is not going to be installed Depends: libpango1.0-0 (>= 1.14.7) but it is not going to be installed xfce4 : Depends: xfwm4 (>= 4.3.99.2) but it is not going to be installed Depends: xfwm4-themes (>= 4.3.99.2) but it is not going to be installed Depends: xfce4-mcs-plugins (>= 4.3.99.2) but it is not going to be installed Depends: xfce4-panel (>= 4.3.99.2) but it is not going to be installed Depends: xfdesktop4 (>= 4.3.99.1) but it is not going to be installed Depends: thunar (>= 0.4.0rc1) but it is not going to be installed Depends: xfce4-utils (>= 4.3.99.2) but it is not going to be installed Depends: gtk2-engines-xfce (>= 2.3.99.2) but it is not going to be installed Depends: xfce4-session (>= 4.3.99.1) but it is not going to be installed E: Broken packages