Cannot Install XFCE

Trying to install XFCE4 on Trisquel 8 does not work. It says there are unmet dependencies. I assume this is because the packages are not quite there.

:~$ sudo apt-get install xfce4
[sudo] password for user:
Reading package lists... Done
Building dependency tree
Reading state information... Done
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:
xfce4 : Depends: xfwm4 (>= 4.12.0) but it is not going to be installed
Depends: xfce4-settings (>= 4.12.0) but it is not going to be installed
Depends: xfce4-panel (>= 4.12.0) but it is not going to be installed
Depends: xfdesktop4 (>= 4.12.0) but it is not going to be installed
Depends: thunar (>= 1.6.6) but it is not going to be installed
Depends: xfce4-session (>= 4.12.0) but it is not going to be installed
Depends: xfce4-appfinder (>= 4.12.0) but it is not going to be installed
Depends: xfce4-pulseaudio-plugin but it is not going to be installed
Depends: orage (>= 4.12.0) but it is not going to be installed
Depends: libxfce4ui-utils (>= 4.12) but it is not installable
Recommends: xorg but it is not going to be installed
Recommends: thunar-volman (>= 0.8.1) 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: Unable to correct problems, you have held broken packages.