I use this quick fix. Not sure if it is appropriate from security perspective:
sudo adduser <the user> lightdm

Doing that, will add "the user" into group lightdm.
Since directory /var/lib/lightdm has group read permission (drwxr-x---), thus 
"df" will not complain anymore.

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https://bugs.launchpad.net/bugs/867806

Title:
  df -h permission denied error

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