OpenOffice.org 3.1.1 was released a few days ago, bringing many bug fixes to the stable 3.1 series. One of the ways to get it on Jaunty is to use the Launchpad.net PPA for OpenOffice.org Scribblers which recently packaged it for Ubuntu Jaunty and included it in their repositories.
To install the latest release using command-line, just use the instructions below:
First, edit the /etc/apt/sources.list file and enter your user password:
sudo nano /etc/apt/sources.list
Add the following two lines (the second one is not necessary, unless you want the sources to be available too):
deb http://ppa.launchpad.net/openoffice-pkgs/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/openoffice-pkgs/ppa/ubuntu jaunty main
Add the trusted key for these repositories: