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 4.2.2 has been recently released. For information about the new features and enhancements brought by the latest update, see the official changelog.
In this article I will show you how to install LibreOffice 4.2.2 on Ubuntu, Linux Mint, Debian, Elementary OS and derivative systems.
For Ubuntu 14.04 Trusty Tahr, LibreOffice 4.2.2 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
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/4.2.2/deb/x86/LibreOffice_4.2.2_Linux_x86_deb.tar.gz
$ tar -xzvf LibreOffice_4.2.2_Linux_x86_deb.tar.gz
$ cd LibreOffice_4.2.2.1_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/4.2.2/deb/x86_64/LibreOffice_4.2.2_Linux_x86-64_deb.tar.gz
$ tar -xzvf LibreOffice_4.2.2_Linux_x86-64_deb.tar.gz
$ cd LibreOffice_4.2.2.1_Linux_x86-64_deb/DEBS
$ sudo dpkg -i *.deb