At the end I decided! I want to uninstall OpenOffice on my Ubuntu 10.04 LTS and substitute it with an always updated LibreOffice. After some researches on the web I decide to develop my own procedure to be sure that LibreOffice will be always updated with the last available edition.
First of all it is necessary to remove OpenOffice:
– go to System –> Administration –> Synaptic Package Manager –> Quick Search and type OpenOffice
– Mark for Complete Removal all the installed OpenOffice software and Apply your choice, then exit the program
Now, open Terminal and add the PPA repository:
sudo add-apt-repository ppa:libreoffice/ppa
Update the system:
sudo apt-get update
Last but not least, go back to Synaptic Package Manager –> Quick Search and type LibreOffice
Select the LibreOffice software and all the add-ons you prefer then Apply your choice.
That’s all! You have the last version of LibreOffice installed on your Ubuntu 10.04 LTS and you are also sure that Synaptic will update the packages when a new version is available! 
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