Getting rid of your old LibreOffice

Remove your old LibreOffice:

sudo apt-get remove libreoffice*

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You probably also want to get rid of the dead PPAs you might have installed for LibreOffice 4.x:

• Open *Ubuntu Software Center
• Go to Edit / Software Source ... / Other Software
• Find and uncheck lines like http://ppa.launchpad.net/libreoffice/libreoffice-4-3/ubuntu. Note that you will probably have at least two lines pertaining to libreoffice.

Installing a new LibreOffice

If you want to upgrade to LibreOffice 5.0 (available on 12.04):

sudo add-apt-repository ppa:libreoffice/libreoffice-5-0

If you want to upgrade to LibreOffice 5.1 (not available on 12.04):

sudo add-apt-repository ppa:libreoffice/libreoffice-5-1

Now install the new version:

sudo apt-get update
sudo apt-get install libreoffice

For a localized interface, install the corresponding language package. Example:

sudo apt-get install libreoffice-l10n-de

If LibreOffice looks like Windows 95 on your machine, also add:

sudo apt-get install libreoffice-gtk