Thanks for your reply. I went to Settings>Privacy. It says
Screen Lock Off
How can that be? If I close the laptop, that is if I take the lid and move it downwards until it touches or almost touches the keyboard, and then open it again, I find a screen showing the date/time in big characters. Then I press the Esc key and now the system prompts me to enter a password (by the way it does not say if it is the root password or the regular user password; I tried with both but it rejects both!). And it shows a button with 'Unlock' written on it!
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