Install LibreOffice in Ubuntu from a Launchpad PPA

LIBREOFFICE

Important notice: to install LibreOffice you must remove OpenOffice so you cannot have both in the same time!
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Applications > Accessories > Terminal or Ctrl+Alt+T ;

$ sudo apt-get remove openoffice*.*
$ sudo add-apt-repository ppa:libreoffice/ppa
$ sudo apt-get update
$ sudo apt-get install libreoffice libreoffice-gnome
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For Gnome Desktop:

$ sudo apt-get install libreoffice-gnome
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For KDE desktop:

$ sudo apt-get install libreoffice-kde
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LibreOffice Write

LibreOffice Calc 

LibreOffice Impress 

The Document Foundation!