A number of distributions mess around with OpenOffice.org and release their own versions. The reasons vary. According to OOo, "Some distributions have strict policies around licensing, which means they have chosen to disable parts of OpenOffice.org which rely on software which does not meet their criteria (e.g. the Fedora rpms have disabled the parts of OpenOffice.org which require Java)." Personally, I prefer the unadulterated version. Not only do you get all the features, but you can also upgrade the moment the latest release is out and not have to wait for your distro's package maintainers to catch up.
In Ubuntu, the first step is to remove the existing packages. The quickest way to do so is to open a terminal session and paste in this command: