I got this crash, again, when software sources asked for my password,
and I hit ESC.  I haven't had a chance to look at the code (and don't
know if I could figure anything out).  That said...   The error says:

  PermissionDeniedByPolicy: com.ubuntu.softwareproperties.applychanges

In my case, is the code presuming the authorization dialog resulted in a
successful authorization?  Perhaps it's lacking a check for whether it
really got permission, or at least how the dialog exited.

Beyond that, should 'permission denied' cause a crash?  That seems like
a case we ought to be able to cover.  Maybe it's not exactly a crash, in
my case: the software-properties-gtk window was still there, and still
responsive, I believe.  But some internals crashed enough to start
apport up.  'Permission denied' does seems like something we should
report to the user, perhaps in a dialog, and not have to throw an
exception for.

Maybe I can get time to look at the code.  Whether I might get anywhere is a 
crapshoot. 
Thanks.

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https://bugs.launchpad.net/bugs/828850

Title:
  software-properties-gtk crashed with DBusException in call_blocking():
  com.ubuntu.SoftwareProperties.PermissionDeniedByPolicy:
  com.ubuntu.softwareproperties.applychanges

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