This was an intentional change:
http://lists.freedesktop.org/archives/lightdm/2014-August/000661.html
>From the NEWS file:
Overview of changes in lightdm 1.11.7
* Use logind to provide the list of seats to use. Deprecate the old method
of manually defining seats.
* Add --show-confi
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: lightdm (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1406140
Title:
li
** Description changed:
Previously lightdm.conf would allow configuration of multiple instances
of the the display manager across multiple instances of the X server,
using [Seat:] section headers. These semantics could be used for
multiseat setup as well as for using different virtual ter
** Description changed:
Previously lightdm.conf would allow configuration of multiple instances
of the the display manager across multiple instances of the X server,
- using [Seat:] section headers. These semantics could be used for
multiseat setup as well as for using different virtual ter
