Problems with Qualcomm Atheros AR9285 Wireless Network Adapter on HP ProBook 4330s on Ubuntu 18.04.3 LTS
Solution 1:
Your adapter is blocked by rfkill. On HP laptops this happens. These are the steps to fix it:
Make sure there is no hardware wireless switch on your laptop and turn it on if it exists.
Check BIOS for wireless options and enable it. Try to reset BIOS to defaults if you don't have a wireless option.
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If nothing helps, blacklist the HP platform driver by running in a terminal:
sudo tee /etc/modprobe.d/blacklist-hp.conf <<< "blacklist hp_wmi"
and reboot.