Can't connect to wifi

[Newlappy123]

I have recently bought new laptop HP 15da007TX and installed Ubuntu 16.04. 

Now  I am not able to connect to WiFi even I can't see any hardware to turn on wifi on the device. Output of iwconfig is no wireless extension s.

And In the output of iwconfig command I cannot find wireless interface.

I have been trying to solve this since last two days, I even tried following answers mentioned in some forums. But unfortunately I Couldn't solve the issue. Kindly help me out.

[Lil_Boy_Blue]

Hi

Credit to Bapoumba, Ubuntu Forums
When troubleshooting wireless, it's important that your system is fully updated by opening a terminal, CTRL+ALT+T. Using a wired internet connection, please run:
Code:

sudo apt update
sudo apt dist-upgrade

and reboot if necessary.

If the issues persist, it is recommended that you install pastebinit, by running:
Code:

sudo apt install pastebinit

This will enable the wireless script to, upon your approval, upload the obtained data to pastebin, creating at the same time a link to it in your terminal, permitting you to paste it to a forum thread.

Once that's done, download and run the wireless info script, which will gather information to help diagnose your system. You can run it using this command:
Code:

wget -N -t 5 -T 10 https://github.com/UbuntuForums/wireless-info/raw/master/wireless-info && \
chmod +x wireless-info && \
./wireless-info

It will create the file "wireless-info.txt" at the location it is run from, and depending on its size, an additional archive called "wireless-info.tar.gz". If you prefer, you can post the file directly to pastebin yourself. Sensitive information like MAC addresses and WPA/WEP keys are masked automatically.

If you aren't able to connect to the internet with the affected system, including via a wired connection, just navigate to this link and follow the instructions there on how to the run wireless script without an internet connection.

[Lil_Boy_Blue]

Hi

Is it a

HP Notebook - 15-da0007tx Product Specifications - 4HG14PA

OR

HP Notebook - 15-da0077tx Product Specifications - 4TT02PA

Either way it seems to be a  --  L21480-005  -  WLAN RT BGN 1x1 +BT4.2LE M

Realtek RTL8723DE 802.11 bgn 1×1 WiFi + Bluetooth 4.2 Combo AdapterL21480-005