Great question — answering as the UphillTech team:
Short answer You need to update, for which you'll need to use an ethernet cable or wifi dongle that works with Linux out of the box. Once you've updated you can simple paste this into the terminal and press enter: echo "options rtl8723be ant_sel=1 fwlps=N" | sudo tee /etc/modprobe.d/rtl8723be.conf If you're asked for your password, enter it and press enter. Now reset your laptop and it should work. If it doesn't, try all the steps above again but this time change ant_sel=1 to ant_sel=2 . Details The problem is that the wifi hardware only has one of the two antennas attached but the hardware reports the wrong antenna. So you need to force the driver to use the correct antenna, which can only...
Full answer by ChrisD: https://askubuntu.stackexchange.com/a/804105 (CC BY-SA 3.0).
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