To install the OpenOffice follow the below steps:

1- To uninstall Libreoffice(if installed) type the below command from terminal

 sudo apt-get remove --purge libreoffice* #if installed

2- To install OpenOffice run the below command from terminal

  //For 32 bit
    wget http://sourceforge.net/projects/openofficeorg.mirror/files/4.1.0/binaries/en-US/Apache_OpenOffice_4.1.0_Linux_x86_nstall-deb_en-US.tar.gz

    //For 64 bit
    wget http://sourceforge.net/projects/openofficeorg.mirror/files/4.1.0/binaries/en-US/Apache_OpenOffice_4.1.0_Linux_x86-64_install-deb_en-US.tar.gz

    //For 32 bit
    tar -xvfz Apache_OpenOffice_4.1.0_Linux_x86_install-deb_en-US.tar.gz

    //For 64 bit
    tar -xvf Apache_OpenOffice_4.1.0_Linux_x86-64_install-deb_en-US.tar.gz

3- Then run the below commands from terminal:

 cd en-US/DEBS/
    dpkg -i *.deb 
    cd en-US/DEBS/desktop-integration
    dpkg -i *.deb

4- Then go to /opt/opneoffice/program and type the below command to start Openoffice services:

 soffice "-accept=socket,host=localhost,port=8100;urp;StarOffice.ServiceManager" -nologo -headless -nofirststartwizard

Hope this will help you :)