Knowage 6.2 Installer in Ubuntu 18.04

I will follow this step for make sure it can work correctly

This video use Knowage 6.2.1 on Ubuntu 18 and Use Oracle JDK 8 and MySQL Server 5.7

Step 1. Install Java / Step 2. Configure System Variables

sudo apt install software-properties-common
sudo add-apt-repository ppa:webupd8team/java
sudo apt update

sudo apt install oracle-java8-installer
sudo apt install oracle-java8-set-default

# Setup JAVA_HOME
export JAVA_HOME=/usr/lib/jvm/java-8-oracle
export PATH=$JAVA_HOME/bin:$PATH

# Verify JDK is Installed
java -version

# java version "1.8.0_201"
# Java(TM) SE Runtime Environment (build 1.8.0_201-b09)
# Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode)

Reference: Command [add-apt-repository] Missing | Install Java 8 | Setup System Variables