Comment 6 for bug 1347964

This is the last thing I can think of:

lance@lance-desktop:~$ apt-cache policy ubuntu-desktop
ubuntu-desktop:
  Installed: 1.325
  Candidate: 1.325
  Version table:
 *** 1.325 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages
        100 /var/lib/dpkg/status
lance@lance-desktop:~$ apt-cache policy ubuntu-session
ubuntu-session:
  Installed: (none)
  Candidate: 3.9.90-0ubuntu12
  Version table:
     3.9.90-0ubuntu12 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages
lance@lance-desktop:~$ sudo apt-get install ubuntu-desktop -s
Reading package lists... Done
Building dependency tree
Reading state information... Done
ubuntu-desktop is already the newest version.
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 ubuntu-desktop : Depends: checkbox-gui but it is not going to be installed
                  Depends: ubuntu-session but it is not going to be installed
                  Depends: unity-control-center but it is not going to be installed
                  Depends: unity-settings-daemon but it is not going to be installed
                  Recommends: cheese but it is not going to be installed
                  Recommends: empathy but it is not going to be installed
                  Recommends: totem but it is not going to be installed
                  Recommends: totem-mozilla but it is not going to be installed
                  Recommends: unity-webapps-common but it is not going to be installed
                  Recommends: xul-ext-unity but it is not going to be installed
                  Recommends: xul-ext-webaccounts but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).