Can't seem to get straightforward Java install

[Dougal]

Hi guys, I have to install openoffice.org java-common-package according to Openoffice 3 to enable me to work with html. I can't for the life of me get the java common package installed.
I just tried an install from Mediakey - Open Source, PHP, Java, SEO, Content Management, MySQL, Virtuel Hosting, Joomla, Linux, Internet Marketing as follows along with the resulting report in Terminal;
sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fontsReading package lists... Done
Building dependency tree
Reading state information... Done
Package sun-java6-jre is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package sun-java6-jre has no installation candidate

Also, when I try to add a repository such as UNI•C jaunty the Software Source 'add' in option just sits there as if I haven't completed the source path - which I probably havne't but, I don't know enough about the correct path to correct the mistake/s.
Your help as always is gratefully received.

[elija]

You should get the Sun Java environment as well as many other useful codecs, fonts etc by installing (k|x)ubuntu-restricted-extras from the repository

So for Ubuntu, open a terminal and execute "sudo apt-get install ubuntu-restricted-extras" (without the quotes)