> But maybe you have some ideas where or what we need to fix?

A potential conflict with PAM settings was my best idea, but that
doesn't seem likely anymore.

> I was able to login in both seats two times today, but I have no
> idea what could caused that

Interesting!  That could indicate a race condition. Try delaying the
start of X on your second seat to see if that helps.

First, create a wrapper script around X that pauses before starting X:

sudo tee /usr/bin/Xdelayed <<EOF >/dev/null
#!/bin/sh
sleep 10
exec /usr/bin/X "$@"
EOF
sudo chmod a+rx /usr/bin/Xdelayed

Next, modify your second seat config in /etc/lightdm/lightdm.conf to use
the wrapper script:

[Seat:1]
xserver-vt=0
xdg-seat=seat1
xserver-command=/usr/bin/Xdelayed <whatever arguments you usually use>

Finally, restart lightdm (sudo service lightdm restart) or reboot and
see what happens.

(I know you know how to create scripts and restart lightdm and whatnot,
I'm just trying to be detailed for the benefit of the lurkers reading
this bug report.)

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https://bugs.launchpad.net/bugs/976124

Title:
  lightdm multiseat: no login possible

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