You will see output similar to the one below – choose the number of jdk-9.0.4 – for example 3 in this list (unless you have have never installed Java installed in your computer in which case a sentence saying “There is nothing to configure” will appear): $ sudo update-alternatives -config java Run: $ sudo update-alternatives -config java This answer lists the other executables available. java, javac, javaws are probably the most frequently required. N.B.: Remember – Java JDK has many more executables that you can similarly install as above. $ sudo chown -R root:root /usr/lib/jvm/jdk-9.0.4 Be sure to use a higher priority if you want Oracle JDK to remain the default.Ĭorrect the file ownership and the permissions of the executables: $ sudo chmod a+x /usr/bin/java This will assign Oracle JDK a priority of 1, which means that installing other JDKs will replace it as the default. $ sudo update-alternatives -install '/usr/bin/javaws' 'javaws' '/usr/lib/jvm/jdk-9.0.4/bin/javaws' 1 $ sudo update-alternatives -install '/usr/bin/javac' 'javac' '/usr/lib/jvm/jdk-9.0.4/bin/javac' 1 Now run: $ sudo update-alternatives -install '/usr/bin/java' 'java' '/usr/lib/jvm/jdk-9.0.4/bin/java' 1

Now move the JDK 8 directory to /usr/lib $ sudo mkdir -p /usr/lib/jvm N.B.: Check carefully this folder name since Oracle seem to change this occasionally with each update. Uncompress it: $ tar -xvf jdk-9.0.4_linux-圆4_bin.tar Download the 64-bit (or 32-bit) Linux “compressed binary file” into your home directory – it has a “.tar.gz” file extension.

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