Step-by-step – OpenJDK 15 Installation in Pop!_OS

Installing

2. 2. Enabling OpenJDK 15 PPA

   Add OpenJDK 15 PPA for Pop!_OS GNU/Linux

   Enabling OpenJDK 15 Repo for Pop!_OS

   OpenJDK 15 PPA for Pop!_OS

3. 3. Installing OpenJDK 15

   Then to Install OpenJDK 15 in Pop!_OS
   First, to look up all the available flavors play:

   sudo apt search openjdk-15

   So next for OpenJDK JDK 15 issue:

   sudo apt install openjdk-15-jdk

   Where for the Java Runtime instead:

   sudo apt install openjdk-15-jre

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo
   Now to Check the current Java:

   java -version

   And in output you find it:

   

   Finally, to check for available Java releases:

   sudo apt search openjdk | grep jdk