>>16350751fedora is about GNOME so all their guides expect you to be using GNOME and not any other DE
just use an official ubuntu flavor if you don't want the zillions of bloat ubuntu stuffs inside their ubuntu OS, consider: Kubuntu (KDE, microsoft-esque DE), Xubuntu (Xfce = lightweight gnome), Lubuntu (LXQt = lightweight KDE).
there is an option within the installation to have a MINIMAL installerino, which just installs the desktop environment which is kinoino because you get to install your web browserino :3 and best of all no excess unnecessary programs you'll never use like 2048 or htop when you can use btop instead! :3c