sudo apt-add-repository ppa:libreoffice/libreoffice-4-0
sudo apt-get update
sudo apt-get upgrade
The first command will add the repository, second command will refresh the repos and the 3rd command will upgrade the packages of the system.
Just open file and select a PDF file. Make Change and Export again as PDF. Free Office suite with a pdf editor. Very Nice Work.
A full changelog for 4.0.4 can be read online at the Document Foundation Wiki.
LibreOffice 4.1 is due for release in late July and will bring with it a number of new features, including font embedding in documents.
LibreOffice 4.0.4 is available for immediate download from the LibreOffice website.