
Close all running web browsers, then open the terminal under Ubuntu 12.04/11.10 and run these commands:
sudo add-apt-repository ppa:upubuntu-com/java
sudo apt-get update
sudo apt-get install oracle-java7-installer
After finishing the installation of Oracle Java 7, open Firefox and go to Add-ons Manager and make sure that the Java Plugin is well installed and enabled:
To uninstall Oracle Java 7, run this sequence of commands:
sudo apt-get install ppa-purge
sudo ppa-purge ppa:upubuntu-com/java
sudo apt-get remove oracle-java7-installer
sudo apt-get update
That's it!
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