Got same issue after an upgrade from Ubuntu 14.04 to 16.04 and the
following actions solved the problem :

sudo pam-auth-update --force
sudo vi/etc/pam.d/lightdm

=> add following lines at the end : 
        session required pam_loginuid.so
        session required pam_systemd.so

sudo reboot

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https://bugs.launchpad.net/bugs/1240336

Title:
  After release upgrade, the user looses permissions for several basic
  actions in the system

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