My brother had this problem solved in the next Ubuntu release (20.04)
(probably due to the fact the kernel version is 5.4+)
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https://bugs.launchpad.net/bugs/1848921
Title:
iwlwifi
I can confirm just disabling the 11n setting does indeed work as a
workaround, tried on an XPS 15 9570 with that WiFi card.
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https://bugs.launchpad.net/bugs/1848921
Title:
iwlwifi