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 4.2.4 RC1 has been recently released. For information about this release, see the changelog.
In this article I will show you how to install LibreOffice 4.2.4 RC1 on Ubuntu, Linux Mint, Debian, Elementary OS and their derivative systems.
Because it is not available via any repository, we have to download the archive containing the libreoffice packages from the official site, extract the archive and install the rpm packages inside. Follow the instructions for you system and architecture exactly, in order to get a successful installation.
How to install LibreOffice 4.2.4 RC1 on 32 bit Ubuntu, Linux Mint, Debian, Elementary OS and their derivatives:
$ wget download.documentfoundation.org/libreoffice/testing/4.2.4/deb/x86/LibreOffice_4.2.4.1_Linux_x86_deb.tar.gz
$ tar -xzvf LibreOffice_4.2.4.1_Linux_x86_deb.tar.gz
$ cd LibreOffice_4.2.4.1_Linux_x86_deb/DEBS
$ sudo dpkg -i *.deb
Optional, to remove LibreOffice 4.2.4 RC1, do:
$ sudo apt-get remove libreoffice*
How to install LibreOffice 4.2.4 RC1 on 64 bit Ubuntu, Linux Mint, Debian, Elementary OS and their derivatives:
$ wget download.documentfoundation.org/libreoffice/testing/4.2.4/deb/x86_64/LibreOffice_4.2.4.1_Linux_x86-64_deb.tar.gz
$ tar -xzvf LibreOffice_4.2.4.1_Linux_x86-64_deb.tar.gz
$ cd LibreOffice_4.2.4.1_Linux_x86-64_deb/DEBS
$ sudo dpkg -i *.deb
Optional, to remove LibreOffice 4.2.4 RC1, do:
$ sudo apt-get remove libreoffice*