I suspect that if you've installed a Linux on your Kindle, no-one here is going to have many ideas.
Apart from a general one: Make sure the battery hasn't run out. Leave it plugged into a wall charger (not a computer USB port) for at least 24 hours, and then try a full reset, whatever that it for your Kindle. (usually, I think, holding the power button down for 20 seconds.)
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