ronj@l:~$ sudo apt-get install ubuntu-gnome-desktop
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 resolve the situation:

The following packages have unmet dependencies:
 ubuntu-gnome-desktop : Depends: gdm but it is not going to be installed
                        Depends: gedit but it is not going to be installed
                        Depends: gnome-contacts but it is not going to be installed
                        Depends: gnome-control-center but it is not going to be installed
                        Depends: gnome-documents but it is not going to be installed
                        Depends: gnome-online-accounts but it is not going to be installed
                        Depends: gnome-shell but it is not going to be installed
                        Depends: gnome-sushi but it is not going to be installed
                        Depends: ubuntu-gnome-default-settings but it is not going to be installed
                        Recommends: deja-dup-backend-ubuntuone but it is not going to be installed
                        Recommends: empathy but it is not going to be installed
                        Recommends: evolution but it is not going to be installed
                        Recommends: plymouth-theme-ubuntu-gnome-logo but it is not going to be installed
                        Recommends: software-center but it is not going to be installed
                        Recommends: totem but it is not going to be installed
E: Unable to correct problems, you have held broken packages.


ronj@l:~$ sudo apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  account-plugin-twitter appmenu-gtk appmenu-gtk3 appmenu-qt appmenu-qt5 bamfdaemon compiz-core compiz-plugins-default friends friends-dispatcher friends-facebook friends-twitter
  geoclue-ubuntu-geoip gir1.2-accounts-1.0 gir1.2-ebook-1.2 gir1.2-grilo-0.2 gir1.2-gucharmap-2.90 gir1.2-messagingmenu-1.0 gir1.2-signon-1.0 gromit hud indicator-appmenu indicator-bluetooth
  indicator-messages indicator-printers indicator-session indicator-sound libbamf3-1 libchamplain-0.12-0 libchamplain-gtk-0.12-0 libcolumbus0-0 libcolumbus0-0-common libcompizconfig0
  libdbusmenu-qt2 libdbusmenu-qt5 libdecoration0 libffi-dev libfriends0 libglewmx1.8 libgupnp-av-1.0-2 libnux-4.0-0 libnux-4.0-common libpcre3-dev libpcrecpp0 libtimezonemap1 libunity-core-6.0-5
  libunity-misc4 libunity-webapps0 libxml2-dev nux-tools python-cssutils python-pocket-lint systemd-shim unity-lens-applications unity-lens-files unity-lens-friends unity-lens-music
  unity-lens-shopping unity-lens-video unity-scope-video-remote unity-services unity-webapps-service
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
ronj@l:~$