Ubuntu can be very good depending on what flavor you go for. I used standard Gnome Ubuntu & found it too buggy. But I have tried Ubuntu Mate & I think Ubuntu Mate is way better than standard Ubuntu. I haven't tried Kubuntu or Ubuntu Studio yet but I had very good experience with KDE Plasma & I'm planning on trying Ubuntu Studio one day. Ubuntu can be very good be you have to pick the right flavour for older & low end hardware
