You might want to set up NixOS with impermanence, with something like https://github.com/nix-community/impermanence https://github.com/nix-community/impermanenc

You might want to set up NixOS with impermanence, with something like https://github.com/nix-community/impermanence https://github.com/nix-community/impermanence. Install an easy to use desktop environment like ElementaryOS, and configure NixOS with or without Flatpak, if you want to give the user the ability to install new software or not. Then set up automatic updates, automatic garbage collection and you have a truly stable system.