HP used to put only 2.4GHz compatible wireless cards in their laptops as it saved the battery life(more important than being connected). You need to make sure your wireless adapter is 5GHz compatible. Go to your control panel/device manager and do a quick check of the wireless card(specs, google it). It's highly likely that the card doesn't support 5GHz connection..
Gigabyte G5 Linux Mint HP Touchpad provided by HP HP Microserver Gen8 10TB Debian Server
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