Solution 1:
Run in a terminal
sudo tee /etc/modprobe.d/blacklist-acer.conf <<< "blacklist acer_wmi"
and reboot. That will remove the module that blocks your Wi-Fi.
Run in a terminal
sudo tee /etc/modprobe.d/blacklist-acer.conf <<< "blacklist acer_wmi"
and reboot. That will remove the module that blocks your Wi-Fi.