How to Install Oracle Java JDK on Ubuntu Linux

This How.com.vn teaches you how to install the Oracle Java 9 JDK on Ubuntu Linux. Keep in mind that, as of March 2018, only the 64-bit version of Java 9 is available for Ubuntu.

Steps

1
Open Terminal. Open the Menu ⋮⋮⋮ and scroll down, then click
Terminal to do so.
- You can also press Alt+Ctrl+T.
2
Remove any current versions of Java. This is extremely important, as failing to do so will render the following instructions useless:
- Type in sudo apt-get purge openjdk-\*
- Press ↵ Enter
- Type in your password if prompted.
- Press Y if prompted, then press ↵ Enter
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Type in sudo apt-get install software-properties-common and press ↵ Enter.^{[1]XResearch source}
4
Remove any old versions of software. Type in sudo apt autoremove and press ↵ Enter, then wait for old software to remove itself. This will both free up space on your computer's hard drive and prevent interference when installing Java.
- The removal process may take several minutes.
Type in sudo apt-get update and press ↵ Enter to ensure that the current software is up-to-date.
Type in sudo add-apt-repository ppa:webupd8team/java and press ↵ Enter.
You'll see a message that reads "Press [ENTER] to continue or Ctrl-c to cancel adding it" at the bottom of the Terminal window; this is where you'll press ↵ Enter.
Type in sudo apt-get install oracle-java9-installer and press ↵ Enter, then type in y and press ↵ Enter when prompted. The Java 9 installer will begin downloading, at which point a confirmation box will appear in Terminal.
Press ↵ Enter once to continue, then use the left arrow key to select Yes and press ↵ Enter again.
Java will take upward of 20 minutes to download, so be patient. Once you see your name appear at the bottom of Terminal again, you may proceed.
Type in sudo apt-get install oracle-java9-set-default and press ↵ Enter, then enter your password if prompted.
12
Check your Java version. Type in java -version and press ↵ Enter. You should see the following text:
- java version "9.0.4"
Type in sudo apt-get update and press ↵ Enter. This probably won't do anything, but it's a good way to ensure that both everything from Java and the rest of your software is up-to-date. Once this command finishes running, the Java JDK is installed; you can exit Terminal.
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Question
My Java version gives me a "cannot execute binary file: Exec format error." What is wrong?
Community Answer
You either have a corrupted copy of Java, or - more likely - you installed a version for a different unix variant and/or CPU architecture.
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Question
What do I do if the Oracle Java9 installer has no installable candidates?
Community Answer
Instead, use: sudo apt install default-jre default-jdk . It seems java9 is no longer supported and not available for download the old-fashioned way.
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Question
When I do step 8 it doesn't work, it comes up with: "Unable to locate package oracle-java9-installer". How to make it work?
Stephen
Community Answer
Installing Oracle Java JDK on Ubuntu Linux is a straightforward process. Here are the steps you can follow: First, update the package index on your Ubuntu system by running the following command in your terminal: "sudo apt-get update" (without the quotes). Next, add the Oracle Java PPA (Personal Package Archive) to your system by running the following command: "sudo add-apt-repository ppa:webupd8team/java". After that, update the package index again by running the following command: "sudo apt-get update". Now, you can install Oracle Java JDK by running the following command: "sudo apt-get install oracle-java8-installer".
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