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A lot has been changed since the release of Netbeans 9.0/10.0. I want a guide for How should I install Netbeans version 9.0/10.0?.

Note: According to Apache NetBeans' release notes (which can be found on Releases / Apache NetBeans under corresponding release) NetBeans 9.0 is compatible with JDK 8, 9 and 10 while NetBeans 10.0 is compatible with JDK 8, 9, 10 and 11. Building NetBeans with an incompatible JDK might cause build errors. Moreover JDK 9 and 10 were non-LTS version of Java which seems to be obsolete as of now and are no longer available in Ubuntu's official repository. The installation process of both is described below.

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  Building from Source:

  
  
  
  
  
  1. 
     

     Download the source zip for:

     
     
     
     
     

     • NetBeans 9.0 from the direct download link

     
     

     • NetBeans 10.0 from Apache Download Mirrors

     
     
     
     
  
  
  2. 
     

     Install either Oracle JDK or OpenJDK.

     
     
     
     
     
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       For Oracle JDK8: Download JDK8 from here and run these commands:

       
       
       

       sudo su
       
       mkdir /opt/jdk
       
       tar -zxf jdk-8u181-linux-x64.tar.gz -C /opt/jdk
       
       update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_181/bin/java 100
       
       update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_181/bin/java 100
       
       

       
       
     
     
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       For OpenJDK8, run

       
       
       

       sudo apt install openjdk-8-jdk
       
       sudo apt install openjdk-8-jre
       
       

       
       
     
     
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       For OpenJDK11, run

       
       
       

       sudo apt install openjdk-11-jdk
       
       sudo apt install openjdk-11-jre
       
       

       
       
     
     
     
     
  
  
  3. 
     

     Install Apache ANT: For installing Apache Ant, run

     
     
     

     sudo apt install ant
     
     

     
     
  
  

  4. Once you’re all set just extract the downloaded source, enter the incubator-netbeans directory and type ant to build the Apache NetBeans IDE.

  
  

  5. Once built, the IDE bits are placed in the ./nbbuild/netbeans directory. You can run the IDE from within the incubator-netbeans directory by typing ./nbbuild/netbeans/bin/netbeans or use ant tryme to run the Apache NetBeans IDE.

  
  
  
  

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  Installing from Binaries:

  
  
  
  
  

  • For NetBeans 9.0: Download the binary zip for NetBeans 9.0 from the direct download link.

  
  
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    For NetBeans 10.0: Download the binary zip for NetBeans 10.0 from Apache Download Mirrors

    
    
    

    Unpack the zip and run netbeans in bin folder using ./netbeans. I'll suggest to make a desktop entry a.k.a. menu shortcut. For details about it read How can I create launchers on my desktop? - Ask Ubuntu.

    
    
  
  
  
  

Apache NetBeans (incubating) can be installed from Ubuntu Software Center directly. The last version is 10.0 and updated at 01.22.2019 .