Comment 3 for bug 88083

Happened also to me (ubuntu):

sudo apt-get install ubuntu-desktop synaptic aptitude
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:
  aptitude: Depends: libapt-pkg-libc6.4-6-3.52 but it is not installable
  synaptic: Depends: libapt-pkg-libc6.4-6-3.52 but it is not installable
  ubuntu-desktop: Depends: apport-gtk but it is not going to be installed
                  Depends: gdebi but it is not going to be installed
                  Depends: gnome-app-install but it is not going to be installed
                  Depends: language-selector but it is not going to be installed
                  Depends: update-notifier but it is not going to be installed
E: Broken packages