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nishanthr@vision:~$ lspci -v | grep -i network  
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device d723

Installing Wi-Fi driver for Realtek Semiconductor RTL8723DE Device [10ec:d723] I had already tried this when I had 16.04LTS and now when I'm trying again it says 

nishanthr@vision:~$ git clone -b extended --single-branch
https://github.com/lwfinger/rtlwifi_new.git fatal: destination path
 'rtlwifi_new' already exists and is not an empty directory.

Then I did this

cd rtlwifi_new/ && git checkout origin/extended -b extended   
sudo make install
sudo modprobe -r rtl8723de  
sudo modprobe rtl8723de

Also tried

sudo apt purge bcmwl-kernel-source  
sudo sed -i '/blacklist bcma/ d' /etc/modprobe.d/blacklist.conf   
sudo sed -i '/blacklist brcmsmac/ d'/etc/modprobe.d/blacklist.conf

And tried changing antenna 

sudo modprobe -r rtl8723de && sleep 5 && sudo modprobe rtl8723de ant_sel=X (X=1,2)

and rebooted several times and still not working.

Zanna
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Nishanth R
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    It's not clear to me that you cleared out the build with the previous kernel version. In the project directory you need to `make clean` and then `make` and then `make install`. – Stephen Boston May 16 '19 at 04:01
  • So you're telling me to do this in rtlwifi_new directory? – Nishanth R May 16 '19 at 04:16
  • From your question, I have the idea that you are installing using the same directory as you used for the previous kernel. If so you can go into that and execute a `git pull`. This will refresh the code but you still need to run the clean. With a kernel change we often have to rebuild our drivers and the build must be a new build with all the previous build artifacts removed. – Stephen Boston May 16 '19 at 04:24
  • All the commands I ran and executed where in same directory,I did install it in the same directory as I did for my previous kernel. Now what do I do ? – Nishanth R May 16 '19 at 04:31
  • Please edit your question to include all the commands you ran, or if the list you give is complete, then please run the commands I suggest. – Stephen Boston May 16 '19 at 06:52

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