lightdm fails to start when the [SeatDefaults] section header is missing
from /etc/lightdm/lightdm.conf.

Background...

I have a setup script I use for all of my Ubuntu installs
(https://github.com/convissor/ubuntu_laptop_installation).  It's gotten
many 12.04 going the way I like it, no problems.  Part of what that
script does is add some lines to /etc/lightdm/lightdm.conf.

On 2014-01-24 I installed Ubuntu 14.04 on a new box for testing
purposes.  That went fine.  Then I ran my setup script.  Then I rebooted
and wound up at a completely black screen.  Every reboot, same thing.
After some tracing what changed, I realized that the [SeatDefaults]
section header is missing from the lightdm.conf file.  So I added that
line at the top of the conf, rebooted, and things ran normally.  Took it
out again to test, rebooted, got the same black screen.

So either the version of lightdm that ships with 12.04 includes a
lightdm.conf file with the header in it, or there's a bug in more recent
lightdm versions that chokes on the incomplete lightdm.conf file my
setup script creates.

Note:  when lightdm chokes, no lightdm log files are created, nor are
there references to lightdm in any log files.

This problem also exists in Ubuntu 13.10.

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https://bugs.launchpad.net/bugs/1164793

Title:
  Lightdm shows black screen during login

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