Please note that the simple test ( cat /proc/self/attr/current ) can be
misleading.

I tried that in Ubuntu 18.04 ( switched to lightdm ) and got "(enforce)"
but some applications like the file manager could browse other user's
home directories.  Most applications including firefox and libreoffice
are restricted.  In Xubuntu the file manager is restricted as well as
every other application I tried.


Is it possible to just eliminate certain applications or prevent launching 
applications in specific ways to guarantee a restricted guest sessions?

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https://bugs.launchpad.net/bugs/1742912

Title:
  Please confine guest sessions again

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