Install openjdk 11 at ubuntu

•  Download jdk11 from https://download.java.net/openjdk/jdk11/ri/openjdk-11+28_linux-x64_bin.tar.gz
•  Extract to /usr/lib/jvm 

sudo tar xvf openjdk-11+28_linux-x64_bin.tar.gz --directory /usr/lib/jvm/

• sudo update-alternatives --config java

  Selection    Path                                     Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/jdk-11/bin/java              3         auto mode
  1            /usr/lib/jvm/java-7-oracle/jre/bin/java   1         manual mode
* 2            /usr/lib/jvm/java-8-oracle/jre/bin/java   2         manual mode

• Install java11 as 3 option

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-11/bin/java 3
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-11/bin/javac 3

• Set java11 as current java version 

sudo update-alternatives --config java and select 3

sudo update-alternatives --config javac and select 3