Edit: Due to the fact that this article is old, the installation instructions may not work anymore. In order to successfully install the latest version of LibreOffice, please access the libreoffice tag and open the latest article (the one on top).
As you may know, LibreOffice is the most popular, open-source Office suite, available by default on some of the most popular Linux systems.
Recently, the first point release of LibreOffice 5.0, LibreOffice 5.0.4 has been released, bringing bug-fixes only.
Up to date packages are available via the LibreOffice PPA, so installing the office suite on Ubuntu systems is easy. Add the PPA to your system, update the local repository index and install the libreoffice package:
$ sudo add-apt-repository ppa:libreoffice/ppa
$ sudo apt-get update
$ sudo apt-get install libreoffice
Optional, to remove libreoffice, do:
$ sudo apt-get remove libreoffice
The installation instructions should work on Ubuntu 15.10 Wily Werewolf, Ubuntu 15.04 Vivid Vervet, Ubuntu 14.04 Trusty Tahr, Ubuntu 12.04 Precise Pangolin, Linux Mint 17.3 Rosa, Linux Mint 17.2 Rafaela, Linux Mint 17.1 Rebecca, Linux Mint 17 Qiana, Linux Mint 13 Maya, Pinguy OS 14.04, Elementary OS 0.3 Freya, Elementary OS 0.2 Luna, Deepin 2014, Peppermint 6, Peppermint 5, LXLE 14.04 and Linux Lite 2.