Hi again QZ,
OK, there are two ways you gain go: You can search around the buntu repos and find the packages for OOo3 or.... you can do what you tried to do, go to the Openoffice site. You just picked the wrong file so no harm no foul.
Go to this link:
There you will see a table. The rows refer to the interface language and the one offering in English is English(US). The columns refer to the type of packages you want. Since you use Kubuntu, choose a "deb" column (either 32 or 64bit according to what Kubuntu you're using (32 or 64) and then click and download the package, ideally to /tmp
Open a terminal and navigate to /tmp and issue the following command (you don't have to be root to do this)
tar zxvf [name of tar.gz file you just downloaded]
tar will unpack the tarball and you will notice that a new directory has appeared under /tmp (called OOO something). cd into the new directory and do an ls (use that command once you're in the OOO folder). You will see a subdirectory called DEBS. Navigate into that directory. One of the debs has "gnome-integration" in its name. Since you use kde you won't need that and you can delete it. Once you've done that use sudo or become root and give this command:
That will install all the debs. And voila! Your new openoffice has been installed in the /opt directory.