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I've googled a bunch of threads and tried many methods therein but still didn't solve the problem. The following one is what I think most useful but still doesn't work to my Dell G3 3590 (2019 version).

Qualcomm Atheros weak Wifi signal on Ubuntu 18.04

rbwang
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  • Use nmcli dev wifi to see (in color) the signal strength of nearby WiFi devices. – WinEunuuchs2Unix Nov 17 '19 at 15:20
  • This is how it looks like when I use nmcli dev wifi. https://imgur.com/1FMyyvl This is how it looks like when I run speed test from google fiber. https://imgur.com/57t66eX When I run it in Windows 10 with the same laptop. https://imgur.com/ShBGYrb Thank you for your reply! – rbwang Nov 19 '19 at 15:09
  • Disabling bluetooth is reported to improve WiFi in some cases. Have you tried that? – WinEunuuchs2Unix Nov 20 '19 at 11:51
  • Yes, all of my previous tests were running with Bluetooth disabled :s Thanks for the suggestion! – rbwang Nov 21 '19 at 16:36

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