java 8 install ubuntu
sudo apt-get install openjdk-8-jdk
                                
                            java 8 install ubuntu
sudo apt-get install openjdk-8-jdk
                                
                            install java ubuntu
sudo apt install default-jdk
                                
                            how to upgrade java 8 to 11 in ubuntu
sudo apt-get install openjdk-11-jdk
$ sudo update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).
Selection    Path                                            Priority   Status
* 0            /usr/lib/jvm/java-9-openjdk-amd64/bin/java       1500      auto mode
  1            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1500      manual mode
  2            /usr/lib/jvm/java-9-openjdk-amd64/bin/java       1500      manual mode
                                
                            linux remove java 11
sudo apt remove openjdk-11*
sudo apt remove icedtea*
                                
                            install openjdk 11 ubuntu
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install default-jdk
                                
                            apt install java 11
sudo apt-get update
sudo apt-get install oracle-java11-installer-local
                                
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