How to install RTL8188EUS driver on ubuntu 18.04

You'll find a known to be working driver on this github:
https://github.com/lwfinger/rtl8188eu

First, undo what you did with provided CD
Then install the driver from github:

# Prepare
sudo apt update
sudo apt-get install -f
sudo apt-get dist-upgrade
sudo apt-get -y install dkms build-essential git

# Go install the driver 
mkdir ~/DriverBuild
cd ~/DriverBuild
git clone https://github.com/lwfinger/rtl8188eu.git
sudo dkms add ./rtl8188eu
sudo dkms build 8188eu/1.0
sudo dkms install 8188eu/1.0
reboot

If the network manager says: "Device is not ready"
Make sure you copied the firmware (rtl8188eufw.bin) to /lib/firmware/rtlwifi/

first, the answer of CMAK.FR is good!

what I explain here is more an adaptation I had to make it work on ubuntu 18.04

# Prepare
sudo apt update
sudo apt-get install -f
sudo apt-get dist-upgrade
sudo apt-get -y install dkms build-essential git

# Go install the driver 
mkdir ~/DriverBuild
cd ~/DriverBuild
git clone https://github.com/lwfinger/rtl8188eu.git
cd rtl8188eu
make
sudo make install