Omer,

How can I verify whether gnome-settings-daemon is crashing? Note that
the problem never happens if I try to use a Gnome (shell) session. Don't
they use gnome-settings-daemon anymore?

The problem does not happen all the time for me. It only happens in the
second seat and after one failure (some time a little more), unity
starts working correctly. As I explained above in the first try
unity_support_test says that unit is not supported but unity-2d is not
correctly started either.  After some tries unity_support_test starts
saying that unity is supported and it starts correctly.

Another way to avoid the problem is to first use a Gnome session,
logging out and then using unity after that. The Gnome sessions seems to
be doing some kind of initialization that unity is lacking.

Finally, I was trying come out with a workaround that would allow me to
use unity-2d only when necessary (a simple one would be to use unity-2d
aways) and I may have found a way to reproduce the behavior in a single
seat environment. Just drop the attached 51force_unity_2D file in the
/etc/X11/Xsession.d and start the regular unity session. What this file
does is set up DESKTOP_SESSION and GDMSESSION environment variables to
"ubuntu-2d", trying to force unity-2d to be used. This approach was
inspired by reading /etc/X11/Xsession.d/50_check_unity_support. In my
machine neither unity nor unity-2d are correctly started. I only get
nautilus running. This is exactly the behavior I am experiencing in the
second seat in the first runs.

** Attachment added: "File that tries to force unity-2d and ends up reproducing 
the bug"
   
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/883225/+attachment/2626798/+files/51force_unity_2D

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https://bugs.launchpad.net/bugs/883225

Title:
  Unity looks strange when used in multiseat setup

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