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I finally, finally found a solution for when the stupid Fn (»function«) key on my laptop keyboard get's »stuck«. This keeps happening to me ever since I started using Ubuntu back in 2014. The effect is that all F-keys are »broken«, and pressing them starts changing system settings (typically printed in blue on the keys), as if the Fn key is constantly pressed. F3 doesn't search but increases the volume. F11 doesn't toggle fullscreen but decreases the screen brightness. I have to hold the Fn key to get the normal F-key functions. I was never able to fix this on my previous Lenovo ThinkPad, but found a solution for my current DELL Latitude 7490. This Ask Ubuntu post lists a few possibilities, and mine is amongst them: Fn + Esc toggles an »Fn lock« feature.
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