If you’re using a previous version of Ubuntu or Linux Mint, such as 12.04 or 13 (the last LTS releases), then you’re probably using an old LibreOffice suite – at least if you choose to use LibreOffice. I believe version 3.6 is in the 12.04 repositories – which I also believe is what is used by Linux Mint 13. There’s nothing wrong with LibreOffice 3.6, but there’s also nothing wrong with wanting the latest and greatest, and 3.6 is quite a few releases behind the current LibreOffice update.
Luckily, whether you wish to re-install LibreOffice or simply update the installation that comes pre-packaged with Ubuntu / Linux Mint, getting the latest version is easy as one command line in terminal.
Simply add the LibreOffice PPA:
sudo add-apt-repository ppa:libreoffice/ppa
You will also want to update the package index:
sudo apt-get update
After this is done, simply load up the Update Manager for whichever OS you’re running, click Check and you’ll find updates listed for LibreOffice. Ubuntu typically prompts to run a partial upgrade, which is fine. I didn’t see this in Linux Mint.
If you’ve removed LibreOffice and need to install from the PPA after you’ve added it, simply submit the following command:
sudo apt-get install libreoffice
That’s it. Whether you upgrading or doing a fresh install, you’ll have the latest release of LibreOffice, along with continuous updates to the application through your Update Manager.