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LibreOffice 4.2, the recently released major update to the default Ubuntu office suite, is now available in its main official PPA, for Ubuntu 13.10 and 12.04. Below you'll find instructions on how to upgrade to this new version using the PPA.

LibreOffice 4.2 Ubuntu Trusty

The new version brings better interoperability with Microsoft OOXML, a new monochrome icon set (not enabled by default), GNOME 3 Application Menu integration and more. For more information about LibreOffice 4.2, see THIS.

In other LibreOffice news, The Document Foundation released LibreOffice Impress Remote for iPhone/iPad in the iTunes Store today. Check out the official release announcement for more information.

Upgrade to LibreOffice 4.2 in Ubuntu 13.10 or 12.04 via PPA

Before proceeding, please note that the packages in the LibreOffice PPA have only experienced minor testing. According to the PPA description, this isn't for the average user so only use this PPA if you know how to use ppa-purge to revert the changes in case something doesn't work as expected. However, "it is way better to use packages from this PPA than using the *.deb files that The Document Foundation provides upstream", mentions the PPA description.

That said, let's proceed with the installation. If you're using Ubuntu 13.10 or 12.04 (and derivatives) with LibreOffice installed from the official repositories, open a terminal and copy/paste the following commands to upgrade to LibreOffice 4.2:
sudo add-apt-repository ppa:libreoffice/ppa
sudo apt-get update
sudo apt-get dist-upgrade
Important: when running "dist-upgrade", make sure it doesn't remove some important system packages!

That's it. For how to enable the new icon theme, see THIS article.

How to revert the changes

If you want to revert the changes and downgrade LibreOffice to the version available in the official Ubuntu repositories, you can use PPA Purge:
sudo apt-get install ppa-purge
sudo ppa-purge ppa:libreoffice/ppa