My experience, using Xubuntu 18.04, was that I downloaded the deb version from the download page (linked off the OpenOffice icon at bottom right of Forum window). Expand that file, then in a terminal do
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sudo apt purge libreoffice*
to remove all traces of LibreOffice. If you do not wish to do this, then read no further.
Then
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cd ~/Downloads/en-US/DEBS
sudo dpkg -i *.deb
cd desktop-integration
sudo dpkg -i *.deb
the en-US portion of the directory path may differ according to the language version you downloaded.
I cannot recollect that I had to download anything else to satisfy dependencies.
Apache OpenOffice 4.1.7 on Xubuntu 18.04.3 (mostly 64 bit version) and very infrequently on Win2K/XP