Yesterday I updated my Ubuntu with the software update tool, after updating and restarting, my WiFi is no longer working. I'm running Ubuntu on a HP laptop. WiFi was working before the update, but now it isn't. I hade the same issue before and I fixed it, but now I forgot how I fixed it.
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I solved the issue by following niranjan7777's comment on Exec format error on Ubuntu. · Issue #393 · lwfinger/rtlwifi_new.
Basically you have to reinstall rtlwifi_new,so first you have to remove it. Use following commands
rm -rf rtlwifi_new/ #or sudo rm -rf rtlwifi_new/
Next get it clone:
git clone https://github.com/lwfinger/rtlwifi_new.git
Change directory:
cd rtlwifi_new/
Now change branch:
git checkout origin/extended -b extended
Next:
sudo make install sudo modprobe -r rtl8723de sudo modprobe rtl8723de
(you will see WiFi is running here)
if signal is weak
sudo modprobe -r rtl8723de && sleep 5 && sudo modprobe rtl8723de ant_sel=2
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make sure to accept your answer if u were able to solve this issue. – geeker Dec 02 '19 at 06:48