Install Kubuntu. I don't recommend Manjaro, Fedora or Mint because I had bad experience with Manjaro (and based on Arch but the updates get (((delayed))) because the Manjaro team makes sure the updates are stable before they push them to Manjaro software repositories.) and Mint is not better than Ubuntu Mate in anyway. Version upgrades are a nightmare in Fedora because they don't always work. I think that Artix, Gentoo and Debian are the best Linux distros overall but I recommend Xubuntu or Kubuntu for beginners (they are really easy to install and both just work) Artix is version of Arch Linux that doesn't have (((SystemD))) instead Artix let's you pick from OpenRC/RunIT/S6.
Ubuntu is indeed cancer, but other "flavors" of Ubuntu aren't. Kubuntu is a flavor of Ubuntu that has KDE instead of (((GNOME 3)))