Install Flatpak

Flatpak is a kewl way to install apps (usually GUI) on linux in a cross-platform way in a sandbox in your home directory.

Do the below on Ubuntu or Enterprise-linux systems. Simplest to reboot your system after the install so the Flathub Repo is recognized.

on Ubuntu

sudo apt install flatpak
sudo apt install gnome-software-plugin-flatpak
sudo flatpak remote-add https://dl.flathub.org/repo/flathub.flatpakrepo

on Rocky or Alama Linux

sudo dnf install flatpak
sudo flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo