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Bruce Ingalls sent us a new and much improved version of his Java Update script for Ubuntu. The script uses Zenity for a GUI so it's very easy to use.

Initially the script only updated JDK (which included JRE), but now can also update Java Runtime Environment separately.

To use it, download JDK or JRE from HERE (by the way, there's a new version available!), extract and install it, then run this script to set the correct paths across your system.

Download and run Update Java script:
sudo apt-get install zenity
wget http://webupd8.googlecode.com/files/update-java
chmod +x update-java
sudo ./update-java

Or manually download it from HERE.

Credits for the script and many thanks: Bruce Ingalls.