@Gunnar: you're right. I acted carelessly (stupidly, perhaps). I'm in
the process of following the details of your response.
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https://bugs.launchpad.net/bugs/1725676
Title:
Keyboard
@Chris: Your case is not a regression one, I suppose, but you rather did
something 'stupid' without realizing the consequences. ;) One way to fix
it is to make use of a bootable USB stick as I mentioned in comment #3.
That would allow you to edit /etc/default/keyboard to a layout with
which you