The "Permission denied" error suggests the apparmor profile, or whatever
else lightdm is doing special to the guest session, is the reason for
this failure.

Can you check in syslog if you have a DENIED message from apparmor?

** Also affects: lightdm (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: unity8 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1644237

Title:
  unity8 fails to start as guest user

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