After a wipe and re-install, I've not encountered this again.
Funnily enough in hindsight, it acts in a similar manner as if there was some
kind of permission mismatch; but I can't go back and verify it now.
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** Package changed: ubuntu = gnome-control-center (Ubuntu)
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https://bugs.launchpad.net/bugs/908592
Title:
System Settings Keyboard Layout Options Key
