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The PPA provides packages for Ubuntu 10.04, 10.10 and 11.04 users. Whilst LibreOffice has yet to make a stable release it is currently at release candidate stage.
To add the PPA and install LibreOffice RC2 run the command below in a new Terminal session: -
sudo add-apt-repository ppa:libreoffice/ppa
sudo apt-get update && sudo apt-get install libreoffice
Now to make it look, well, nice under your desktop enviroment.
Ubuntu users should also run
sudo apt-get install libreoffice-gnome
Kubuntu users: -
sudo apt-get install libreoffice-kde