Hello again,
I finally solved my issue in a way that ashame me because I’m dumb;
The gnome-terminal has 2 color schemes: one for text and another for color palette. If I change the first to white over black, the background is black but it changes as soon as I launch the game.
But if I change the second too to terminal colors or rxvt, then, whe game launches, black background remains.
Thank you @anothersimulacrum for your help and sorry for this post about a problem, in the end, so easy and inexistent.
Good cataclysm.
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