Oracle Java SE 13 was released September 2019. The latest update of Java JDK is 13.0.2. In this post we install the JDK in Ubuntu Linux 18.04 LTS.

# Remove the OpenJDK/JRE completely 
$ sudo apt-get purge openjdk-\* 

$ sudo mkdir -p /usr/local/java 

# Download the Oracle Java JDK for Linux.
$ wget --no-check-certificate -c --header  "Cookie: oraclelicense=accept-securebackup-cookie" ""

$ sudo cp -r jdk-13.0.2_linux-x64_bin.tar.gz /usr/local/java/

$ cd /usr/local/java

# Unpack the compressed Java binaries
$ sudo tar xvzf jdk-13.0.2_linux-x64_bin.tar.gz

# Edit the system PATH file /etc/profile and add the following system variables to your system path.
$ sudo vim /etc/profile

export JAVA_HOME
export JRE_HOME
export PATH

# Inform Ubuntu Linux system where your Oracle Java JDK/JRE is located.
$ sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk-13.0.2/bin/java" 1

$ sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk-13.0.2/bin/javac" 1

# Inform Ubuntu Linux system that Oracle Java JDK/JRE must be the default Java.
$ sudo update-alternatives --set java /usr/local/java/jdk-13.0.2/jre/bin/java

$ sudo update-alternatives --set javac /usr/local/java/jdk-13.0.2/bin/javac

#Reload the system PATH  
$ . /etc/profile

# Test to see if Oracle Java is installed correctly
$ java -version

Update: To download Java JDK 14 use the below command

$ wget --no-check-certificate -c --header  "Cookie: oraclelicense=accept-securebackup-cookie" ""