I have it set up. Try the AIO docker image. Once you get it set up, it pretty much just works. You just pick which office suite you want, check a few optional features if you want 'em, and it handles the rest for you. Most importantly, the AIO image is from nextcloud. They test it, it always works because it is the blessed version from them. If you’re not a Linux guy, don’t try the other installation methods, they’re much, much more difficult.