Updating old versions of ubuntu
The removing Java is different in Windows, Mac OS, and Ubuntu, so find a guide related to your operating system below.
They are essentially invalidating the significance of version numbers. Debian validated that version of their operating system against all of the features in 1.0.1e.
As a second requirement – you shouldn’t afraid to use terminal.
You could try updating your distro (canonical) version of Firefox but IIRC the version of Ubuntu you appear to be on 8.04 LTS (Lucid) may not offer official upgrades of Firefox (or presumably other software such as Open Office/Libre Office).
If you want to remove Java from registry Oracle recommends to use Microsoft utility.
As a first requirement for uninstalling Java on Mac OS – you should have administrator privileges.