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Issue:
Ubuntu 20.04 cannot find WIFI.

Check:

1. Windows system can find the wifi.

2. Ubuntu check kerner version >= 5.15

uname -r

3. Change BIOS

secure boot: Custom -> Standard

(this may not useful)

4. Using synapitc package manager to install driver

sudo apt-get install synaptic

Search: iwlwifi, and find the correct version for current kernel.

5. reboot

Done.