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The "start.sh" of the Linux version tries to change the permissions of and launch "Mutazione.x86_64" when the binary is called "mutazione.x86_64". While on some plattforms, such as Windows and Mac, filenames are not case-sensitive, on Linux they (usually) are, thus "Mutazione.x86_64" is not the same as "mutazione.x86_64". This prevents launching the game from the menu, Launching the binary directly from the terminal or file manager works fine though.