The R7-371T model that ships in North America has a backlit keyboard. FN+F9 decreases the keyboard backlight brightness, and FN+F10 increases the keyboard backlight brightness. While we can't help with Ubuntu, the best way to troubleshoot this is to restore the system back to factory configurations and test those function keys before installing any other software or operating system. If it works then this function is working as it should. If the keyboard light does not work after a restore then we would recommend the system be serviced for the keyboard light. Should this be the case please contact the Acer support for your region from this link:https://www.acer.com/worldwide/
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