Earlier quoted context omitted.
Everybody is using LibreOffice, except a poor few that get misguided by search services to the Apache OpenOffice website. IMHO there is no sane reason why Apache OpenOffice still exists. Edit: Looks like there are a lot more OpenOffice users out there than I thought, sorry. I really thought the world would have moved on, at least since 2013/14, see https://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/St...
My father's been a happy Ubuntu user for years (and a fairly resentful one for a few more years --- he still misses the old GNOME user interface and loathes Unity). He mainly uses it for Gimp and LibreOffice. When he had to switch from OpenOffice to LibreOffice he was pretty close to packing it all in and using something else; his argument was: why should he trust a package produced by an organisation that can't keep…
Why doesn't he use Mate? Ubuntu Mate is readily available on the Ubuntu website. Is he aware that it's a continuation of the old Gnome (Gnome 2)? And well-maintained to boot.