Ubuntu 18.04: *Completely* disable laptop sleep when closed.

[Robert Heller]

I need to be able to access my laptop, when I am logged out (console login) 
with the lid closed.  What is the "magic" to do that?  I managed to disable 
that function when logged in and running the GUI, but I need to also be able 
to do it when logged out.  I *don't* use the GUI login.  The machine come up 
to multi-user boot with a (black) console login -- I start the GUI from my 
login with startx.

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