GNU/Linux Ubuntu 18.04 Installing Realtek Wi-fi Driver Setup Guide
You are Welcome! The Tutorial Shows You Step-by-Step How to Install Realtek Wireless Card Driver in Ubuntu 18.04 Bionic LTS GNU/Linux.
And this Realtek WiFi Driver Ubuntu 18.04 Setup cover All the following Models:
RTL8188EU
RTL8190P
RTL8192DU
RTL8192EE
RTL8723AU
RTL8723BU
RTL8723DS
RTL8812AU
RTL8822CE
Especially relevant, if you have Different Card then See this Other Guide: How to Install Realtek Wifi Drivers on Ubuntu.
Finally, you may need to upgrade Ubuntu Bionic to Linux Kernel 5.x to achieve this Setup.

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1. Launching Shell Emulator
Open a Terminal window
Ctrl+Alt+t on Desktop
(Press “Enter” to Execute Commands).And Update Ubuntu Apt Repository:
sudo apt update
Authenticate with the User Admin Pass.
If Got “User is Not in Sudoers file” then see: How to Enable sudo. -
2. Installing Requirements
Then to Install Required Stuff
Run:sudo apt install gcc make build-essential git linux-headers-$(uname -r)
Authenticate with the User Admin Pass.
If Got “User is Not in Sudoers file” then see: How to Enable sudo.
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