LibreOffice the forked open source suit emerging from Open Office is now available in Launch pad PPA. The current version of LibreOffice 3.3 RC 2 can now be installed using a PPA on Ubuntu.
A Word of Caution: Installing LibreOffice will lead to complete removal of Open Office. So if you are using Open Office and want to keep it then this method is not suitable.
Install using the terminal:
[sourcecode lang='bash']sudo apt-get purge openoffice*.*
sudo add-apt-repository ppa:libreoffice/ppa
sudo apt-get update
sudo apt-get install libreoffice[/sourcecode]
Also, install the following packages for better compatibility with your desktop environment.
[sourcecode lang='bash']sudo apt-get install libreoffice-gnome[/sourcecode]
[sourcecode lang='bash']sudo apt-get install libreoffice-kde[/sourcecode]