Downgraded to those 6 .28.0-0ubuntu1 packages and rebooted: both user switching 
(black screen, unresponsive computer at 1st attempt at going to user switch 
screen) and hibernate resume failed.
Reverting to lightdm and all those function again

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https://bugs.launchpad.net/bugs/1777405

Title:
  Freezes on switching back from second login

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