I can't reproduce any such problem on a pure 16.10 install. The error:

  what():  option cannot be specified more than once

implies that your lightdm is passing an extra option when it executes
the unity-system-compositor command.

** Also affects: lightdm
   Importance: Undecided
       Status: New

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

You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.

  Unity8 session fails to start due to unity-system-compositor

Status in Light Display Manager:
Status in Unity System Compositor:
Status in lightdm package in Ubuntu:

Bug description:

  I've upgraded to 16.10 to try out the latest and the greatest.
  Unfortunately, the Unity8 session does not work anymore. It was
  working as expected on 16.04 with the overlay PPA.

  When I select "Unity8" in lightdm and enter my password, the password
  box disappears, and nothing else happens. I can still access all the
  indicators, so lightdm is not completely frozen. I then have to reboot
  or restart lightdm in tty1 to log in Unity 7.

  I do have a "system problem detected" warning and I did send the
  report, but I can't find it on Launchpad, that's why I'm filing this
  bug manually.

  I'm using Ubuntu 16.10 64bits, with the opensource radeon driver.

  Further info from the automatic bug report:
  Title : unity-system-compositor crashed with SIGABRT in 

  I'm attaching some logs that might be useful.


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