Lightdm 1.18.2 login fails with multiseat

Bug #1609959 reported by Geert Hedde Bosman
This bug report is a duplicate of:  Bug #1605991: Multiseat login stopped working. Edit Remove
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
Light Display Manager
New
Undecided
Unassigned

Bug Description

Each time a user logs in on a seat on my Ubuntu 16.04.1 dual-seat computer, no one can log in on the other seat. The screen will show "Failed to authenticate" message. Only after the first user logs off, the second seat user is able to log on. This problem is happening after Ubuntu upgraded lightdm to 1.18.2. The current workaround is force downgrade lightdm to 1.18.1. This problem is better explained and fully documented by an arch linux user here: https://bbs.archlinux.org/viewtopic.php?id=215173

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