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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Maybe also of interest of anyone coming to this question: https://askubuntu.com/questions/1014198/how-to-make-intel-wi-fi-signal-stronger-in-ubuntu-gnome-16-04-or-18-04 – Homero Esmeraldo Jun 16 '20 at 01:35
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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.
In this example, they are identified as Main and Aux.
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