Robert, could you look if the logs are useful, it seems similar to bug
#851345
** Changed in: lightdm (Ubuntu)
Importance: Undecided => High
** Changed in: lightdm (Ubuntu)
Assignee: (unassigned) => Robert Ancell (robert-ancell)
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https://bugs.launchpad.net/bugs/863054
Title:
random login without common admin user permissions
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