[SOLVED]wifi driver not installed on HP-Laptop-15-da0xxx,

#issue with Network controller [0280]: Realtek Semiconductor Co., Ltd. Device [10ec:d723] been not detected by Ubuntu 18

1.Checking for wireless device

tony@techyoga:~$ lspci -nnk | grep -iA3 net
01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 15)
Subsystem: Hewlett-Packard Company RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [103c:84ad]
Kernel driver in use: r8169
Kernel modules: r8169
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. Device [10ec:d723]
Subsystem: Hewlett-Packard Company Device [103c:8319]
Kernel driver in use: rtl8723de

Kernel modules: rtl8723de, wl


2.Instal dkms if not installed

tony@techyoga:~$ sudo apt install git dkms
Reading package lists... Done
Building dependency tree
Reading state information... Done
dkms is already the newest version (2.3-3ubuntu9.5).
dkms set to manually installed.
git is already the newest version (1:2.17.1-1ubuntu0.4).
upgraded, 0 newly installed, 0 to remove and 79 not upgraded.


3.
tony@techyoga:~$ git clone -b extended --single-branch https://github.com/lwfinger/rtlwifi_new.git
Cloning into 'rtlwifi_new'...
remote: Enumerating objects: 4, done.
remote: Counting objects: 100% (4/4), done.
remote: Compressing objects: 100% (3/3), done.
remote: Total 3504 (delta 3), reused 1 (delta 1), pack-reused 3500
Receiving objects: 100% (3504/3504), 11.58 MiB | 86.00 KiB/s, done.
Resolving deltas: 100% (2823/2823), done
.


4.tony@techyoga:~$ sudo dkms add rtlwifi_new

Creating symlink /var/lib/dkms/rtlwifi-new/0.6/source ->
/usr/src/rtlwifi-new-0.6

DKMS: add completed.

5.tony@techyoga:~$ sudo dkms install rtlwifi-new/0.6

Kernel preparation unnecessary for this kernel. Skipping...

Building module:
cleaning build area....(bad exit status: 2)
make -j4 KERNELRELEASE=4.15.0-58-generic -C /lib/modules/4.15.0-58-generic/build M=/var/lib/dkms/rtlwifi-new/0.6/build..........................
cleaning build area....(bad exit status: 2)

DKMS: build completed.

rtl_pci.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl_usb.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtlwifi.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

btcoexist.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

halmac.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

phydm_mod.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8188ee.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8192c-common.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8192ce.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8192cu.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8192de.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8192ee.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8192se.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8723ae.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8723be.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8723de.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8723-common.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8821ae.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

rtl8822be.ko:
Running module version sanity check.
- Original module
- Installation
- Installing to /lib/modules/4.15.0-58-generic/updates/dkms/

depmod..........

DKMS: install completed. 


These steps worked for me and my on board WiFi was detected after REBOOT. 

just using inbuilt WiFi for Hotspot for mobile!!!