OpenOffice.org's main development community has split off and founded LibreOffice, freeing the alternative office suite from Oracle supervision. If you'd like to make the switch on your own Ubuntu, Linux Mint or Debian system, it's not too hard.
Daily Tech Tips lists the commands need for a terminal-based installation of LibreOffice. For some experienced users, knowing that the best repository available at the moment is
http://download.tuxfamily.org/gericom/libreoffice might be enough to get started, but the full list of instructions is at the link. As for removing OpenOffice.org, the best bet for those who don't want to wade through very long and involved command line work is to use the Software Center to search for openoffice and remove everything related.
How to install libreoffice in Ubuntu using PPA [Daily Tech Tips]