Ubuntu Geek shows you how to install LibreOffice 3.5.1 on Ubuntu

LibreOffice is the power-packed free, libre and open source personal productivity suite for Windows, Macintosh and GNU/Linux, that gives you six feature-rich applications for all your document production and data processing needs: Writer, Calc, Impress, Draw, Math and Base. Support and documentation is free from our large, dedicated community of users, contributors and developers.

  How to install LibreOffice 3.5.1 in ubuntu using PPA