How do I install Java, including in my browser, so websites with Java work?
There are several implementations of Java. The three most common implementations when talking about it for Ubuntu are:
Since Ubuntu 11.10 (Oneiric Ocelot) and due to license issues Ubuntu will no longer distribute Oracle's JDK and JRE. Also, previous versions supplied on PPAs suffer from security issues and are not recommended to be installed on any Ubuntu system.
There are no more supported .deb releases from Ubuntu with reference to Sun Java or Oracle Java, Ubuntu officially supports OpenJDK and OpenJRE implementation of Java which is the base for Oracle's own implementation.
OpenJRE is the official implementation of Java Runtime Environment (JRE) for your Ubuntu systems and should suffice to run any Java program that you might require and it's included in the main repository and it's easily installable.
Or by opening a terminal and typing
Also important is to install the wrapper for supporting Java applications on your web browser, the Iced-Tea Java Plugin.
Or via a terminal
Or look for
To make sure that you are running the correct version of Java, use this command to set your choice:
If you need to install OpenJDK-JRE 6 or OpenJDK-JDK 6
Install it with
Or if you need the developers' package,
A version of the
Install it with:
If you really want to use Oracle's Java SE Platform, see How can I install Sun/Oracle's proprietary Java JDK 6/7/8 or JRE?.
Installing OpenJDK is not enough for enabling Java in browsers. You'll also need to install the
A restart of the browser might be required.
For installing Oracle Java 7:
Installing OpenJDK - Recommended
The simplest way to install Java on Ubuntu is to use OpenJDK. This will work fine for most people. To install it, click on the small button with the Ubuntu logo on it, as shown in the screenshot below.
After opening the Dash Home, you need to type in Terminal. Click on the icon that is circled in the screenshot below.
This will open the Terminal, which is Ubuntu's version the the Windows Command prompt, though the Terminal has many more features. Now, copy and paste the following command into the Terminal window. You will need to use ControlShiftV to paste text into the terminal.
You will need to enter your password to use this command. Although it will not show up in the Terminal, it will still be entered when you type it. After running this command, you will be set up to run and develop Java applications.
Installing Oracle Java
OpenJDK works fine for most people, but if you play Minecraft, you will want to use Oracle Java instead. To install Oracle Java, run the command below one at a time in the Terminal.
This will download Java from Oracle's website, and install it for you.
Open your terminal with Ctrl+Alt+T and:
Now this will install the latest Java version
Oracle Java 8 was just released (stable). To install it in Ubuntu, you can use the WebUpd8 Java PPA:
The PPA itself doesn't provide Oracle Java 8 binaries (that's not allowed by the Oracle Java license). Instead, an installer is used that automatically downloads and installs Oracle Java 8. Using this PPA, you'll also receive automatic Java 8 updates.
More information and some tips on using / further configuring Oracle Java 8 @ WebUpd8 is in Install Oracle Java 8 In Ubuntu Via PPA Repository [JDK 8].
Unfortunately, because of issues with its license, Oracle Java is no longer distributed within the official Ubuntu repositories. You have two main options: either try OpenJDK -- an open source replacement for Oracle Java -- or proceed with the "manual" installation (which is exactly what you were trying to do). Both these options are described on the help wiki: https://help.ubuntu.com/community/Java. This page also include some other alternatives that, depending on your needs, you may find more suitable.
Just a side note: most of the time, with Ubuntu, you should not download software from the Internet, but rather use the Ubuntu Software Center. The software you'll find there is ensured to be stable, safe and to respect the standard conventions of the system. Oracle Java is just an exception to this rule.
There are a few ways to install Java in Ubuntu:
Install OpenJDK (The open source equivalent to Sun's Java) directly from Ubuntu Software Center. All you need to do is search for Java. That tends to work as is for me.
If you need Sun's Java, say if you want to play Minecraft, you download the JRE as you described from Java.com, but make sure your .bin-file can be executed. You do that by opening a terminal and typing the following (I will assume you have it in your Downloads folder so change the cd line accordingly if that's not where it is):
Then, you should be able to close your terminal, right click on your .bin-file and select "Execute", which should run the installer. If this is not an option, just do the following from terminal (in the same folder as the two other actions):
That simply runs the specified file and if you successfully typed in the two first lines, the installation.
If you are missing Java in Firefox, then
This script will overwrite libnpjp2.so even if it exists, but points to wrong file (for example, the symlink is broken).
I made a text-based Java installer using terminal commands. It uses
You can download the installer from Google Drive here. Then put it in your home folder, open Terminal and type