I have the LibreOffice that comes by default with Ubuntu 2018.04 LTS, all updated.
Tools menu I noticed this intriguing item called
Mail Merge Wizard… so I clicked on it. The following popped up:
OK, no problem, I click
Restart Now, wait for it to restart, click again and… the same popup comes again. And again.
How to make it work?
My half guess is that I have to install some extra software, maybe LibreOffice Database?