Setting up gdm (2.20.1-0ubuntu1) ...
Adding group `gdm' (GID 123) ...
Done.
Warning: The home dir you specified already exists.
Adding system user `gdm' (UID 118) ...
Adding new user `gdm' (UID 118) with group `gdm' ...
The home directory `/var/lib/gdm' already exists. Not copying from `/etc/skel'.
adduser: Warning: that home directory does not belong to the user you are currently creating.
* Reloading GNOME Display Manager configuration... * Changes will take effect when all current X sessions have ended.
invoke-rc.d: initscript gdm, action "reload" failed.