Cannot see my wifi [10ec:d723] when trying Ubuntu [duplicate]

A linux driver is available on smlinux/rtl8723de

Requirements :

A linux kernel >= 4.11

The appropriate linux-headers to your kernel version should be installed.

git clone https://github.com/smlinux/rtl8723de
cd rtl8723de
make 
sudo make install
sudo modprobe -v 8723de

The dkms way (the instructions from the developer's driver):

git clone https://github.com/smlinux/rtl8723.git -b 4.11-up
sudo dkms add ./rtl8723de
sudo dkms install rtl8723de/5.1.1.8_21285.20171026_COEX20170111-1414
sudo depmod -a
sudo reboot

Update:

To install a kernel version greater than 4.11 you can use the ukuu tool.

sudo apt-add-repository -y ppa:teejee2008/ppa
sudo apt-get update
sudo apt-get install ukuu

To list the available kernel version:

sudo ukuu --list

To install a specific kernel version (e.g: 4.11.12):

sudo ukuu --install v4.11.12

See ukuu --help.

Ubuntu wiki : To install a mailine kernel with the appropriate linux-headers package.

This device Network controller: Realtek Semiconductor Co., Ltd. Device d723 is not supported by Linux yet.

It is rtl8723de. There are no vendor drivers either.

Update: The device is supported by Linux 5.3+ now.