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).

The latest installation instructions for LibreOffice
Hello Linux Geeksters. As you may know, LibreOffice is a popular office suite, being available for Linux, Windows and Mac OS X. The latest stable version available is LibreOffice 4.2.3, which has been recently released, coming with both a lot of new features and bug-fixes. For more information, see the release notes.
In this article I will show you how to install LibreOffice 4.2.3 on Ubuntu, Linux Mint, Debian, Elementary OS and their derivative systems
For Ubuntu 14.04 Trusty Tahr and Linux Mint 17 Qiana, LibreOffice 4.2.3 can be easily installed via the LibreOffice PPA. Follow the below instructions exactly, in order to get a successful installation:
$ 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
Or, you can also disable the PPA, remove libreoffice and downgrade all the packages that got updated via the PPA:
$ sudo apt-get install ppa-purge
$ sudo ppa-purge ppa:libreoffice/ppa
For other systems, we have to download the pre-compiled binaries from the official site, extract the archive and install the deb packages inside. Follow the instructions for your system and architecture exactly, in order to get a successful installation.
How to install LibreOffice 4.2.2 on 32 bit Ubuntu, Linux Mint, Debian, Elementary OS and derivative systems:
$ wget download.documentfoundation.org/libreoffice/stable/4.2.3/deb/x86/LibreOffice_4.2.3_Linux_x86_deb.tar.gz
$ tar -xzvf LibreOffice_4.2.3_Linux_x86_deb.tar.gz
$ cd LibreOffice_4.2.3*_Linux_x86_deb/DEBS
$ sudo dpkg -i *.deb
How to install LibreOffice 4.2.2 on 64 bit Ubuntu, Linux Mint, Debian, Elementary OS and derivative systems:
$ wget download.documentfoundation.org/libreoffice/stable/4.2.3/deb/x86_64/LibreOffice_4.2.3_Linux_x86-64_deb.tar.gz
$ tar -xzvf LibreOffice_4.2.3_Linux_x86-64_deb.tar.gz
$ cd LibreOffice_4.2.3*_Linux_x86-64_deb/DEBS
$ sudo dpkg -i *.deb
Optional, to remove LibreOffice on both 32 bit and 64 bit Ubuntu, Debian and derivatives, do:
$ sudo apt-get remove libreoffice