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This question and answer Low Wi-Fi signal in HP laptop with Ubuntu 16.04 explains how to solve a wifi weak signal problem by selecting the antenna in the case of a Realtek network adapter. Is there any way to do the same with the Intel adapter with the iwlwifi driver?

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Some Linux drivers have a setable parameter to prefer antenna 1 vs. antenna 2. Your driver, iwlwifi, does not. I suggest that you check to see that both antenna wires are firmly snapped in place.

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In this example, they are identified as Main and Aux.

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