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This question already has an answer here:

What gives? How come Ubuntu chews through both of my two batteries so fast?

Using 18.04.1 by the way.

marked as duplicate by N0rbert, karel, Fabby, Zanna, Tom Brossman Nov 9 '18 at 19:19

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That's because Ubuntu is hardware-agnostic and you need to set the battery savings yourself for your particular hardware.

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