After much wandering around and discover the cause of the error, I could solve my problem, but not the cleanest way ...
When I discovered that the error was caused by the version of fontconfig that I had installed, delete the repository where was, so the first thing was to follow the instructions recommended in the ppa to remove
Code:
sudo apt-get purge libpam-systemd
sudo apt-get install libpam-xdg-support
then uninstall the repository ppa: gnome3-team/gnome3-staging
Code:
sudo ppa-purge ppa: gnome3-team/gnome3-staging
and then to be safer
Code:
sudo apt-get install ubuntu-gnome-desktop ubuntu-gnome-default-settings
Now all work fine