Because I had to click around a few times, trying out instructions that did not work, here’s a link to instructions that actually do install LibreOffice on Uubuntu. The instructions that don’t work tell you to open a DEBS folder that does not exist. The instructions that do work have you use a PPA (Personal Package Archives), about which you need to know as little as I do (= nothing).

You do have to know how to type commands in a terminal window, however.

Also, this installation leaves your old copy of Open Office untouched. If you want to uninstall Open Office entirely, I am told you should type this into a terminal: sudo apt-get remove openoffice*.*

LibreOffice is the fork from Open Office now that Oracle has taken possession of the latter. Right now it’s almost exactly the same, but it’s where the interesting future developments will occur.