don't do kubuntu, it is a terrible place to start for beginners. I don’t think we should be recommending ubuntu at all, I think bazzite is objectively a better starting place.
The mere fact that bazzite and other immutables generate a new system for you on update and let you switch between and rollback automatically is enough for me to say it’s better, but it also has more up to date software, and tons of guides (fedora is one of the most popular distros, and bazzite is essentially identical except with some QoL upgrades).
How common is the story of “I was new to linux and completely broke it”? that’s not a good user experience for someone who’s just starting, it’s intimidating, scary, and I just don’t think it’s the best in the modern era. There’s something to be said about learning from these mistakes, but bazzite essentially makes these mistakes impossible.
Furthermore because of the way bazzite works, package management is completely graphical and requires essentially no intervention on the users part, flathub and immutability pair excellently for this reason.
theres also the fact that ubuntu ships very out of date software... among other things regarding privacy concerns, snaps being terrible, just don't.
I have 15 years of linux experience and am willing to infinitely troubleshoot if you add me on matrix.