@Mario-CH I got it working now. There was one setting in my router that thought that there was MAC address spoofing going on. Anyway, this OTA-3 is so good and so stable, especially coming from Xenial. It's even better than when I tried OTA-2, which wasn't tested on the Xperia X.

@rugby There is a huge lack at this level and yet a real demand. Nothing new on the program. There is only the Sony Xperia X indeed, although not very recent. As a user, this mid-range smartphone https://m.gsmarena.com/samsung_galaxy_xcover_5-10718.php seemed like a candidate for its price, size and performances, although I don't know anything about the feasibility of a focal port by a developer.

@emphrath we cannot take packages from Debian instead of Ubuntu. Thats not how distro packaging works