Well I can say Godot is good if you plan more things then any normal Visual Novel. You could make also the game in 3D. Also I know some people can unpack those Renpy files.
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I mean it seams like a basic Visual novel and many people are using ren'py for that. And Ren'py games work pretty well on linux. Or I'm not totaly sure but Godot should have a unity project import (or it's planed) and that should also work well on linux. Ubuntu 12.04 is pretty outdated and Ubuntu 18.04 is the newest. I mean you could try it in a virtual Machine because Ubuntu is free or there are other dev's they know what to do to fix it.
Well first I thought 1.3 GB damn this must be a great and long game but I got (almost) every ending in 1h. But why is it so big? Because of those Movie Clips. I Think if you delete them and just use some images this Game only needs 500MB. Maybe less. BUT you could play it on Linux. There is an .sh File and it works.