To uninstall Libre Office and Install Apache Open Office. If you like Apache more then Libre.
First you need to remove the official repository
sudo apt-get remove --purge libreoffice*

Remove deb package
sudo dpkg -P libreoffice

To install Apache Open Office first you need to download it.
You can download the newest version here:
http://beast-usa.com/downloads/free-office-software.html 

Then open a Terminal Window (if you downloaded to your Downloads folder)
cd Downloads
username:~/Downloads tar -xvzf "linux package name".tar.gz
cd Downloads/en-US/DEBS
OR cd Downloads - cd en-US - cd DEBS

sudo dpkg -i *.deb
Password: ******
cd desktop-integration (username:~/Downloads/en-US/DEBS/desktop-integration)
sudo dpkg -i *.deb

Then of course run this:
sudo apt-get update

Now you should have only Apache Open Office.