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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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