

If you(they) don’t mind having outdated software Debian stable might be worth looking into. Otherwise there are immutable distros which are very hard to fuck up, and even if you do there is the option to rollback to the previous version. I’d recommend Aurora or Fedora (fedora doesn’t include some proprietary stuff like some codecs so if you need that it’s probably better to use Aurora).
Linux Mint also has a version based on Debian stable, LMDE, which is could also be an option. It’s not as stable as Debian as it adds its own stuff but has the out of the box experience.
As general advice I’d suggest using less packages and more flatpaks as a faulty flatpak update can only break that flatpak, not your system. For packages be sure to disable online updates, meaning you have to reboot to apply them. This isn’t as convenient but if stability is that important to you I’d go for it
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