Important Note: See updated information below.
This is a tutorial for beginners. Just open console and run following commands:
Java 6 installation:
sudo add-apt-repository ppa:ferramroberto/java
sudo apt-get update
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sudo add-apt-repository ppa:sun-java-community-team/sun-java6
sudo apt-get update
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sudo apt-get install sun-java6-jre sun-java6-bin sun-java6-jdk sun-java6-fonts
Use Java 6 as default:
sudo update-alternatives --config java
Select: /usr/lib/jvm/java-6-sun/jre/bin/java
Firefox Java plugin installation:
–64bit–
cd /usr/lib/mozilla/plugins
sudo ln -s /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so
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–32bit–
cd /usr/lib/mozilla/plugins
sudo ln -s /usr/lib/jvm/java-6-sun/jre/lib/i386/libnpjp2.so
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Have a nice day.