Flameshot unable to capture screen

Ubuntu uses Wayland, and Flameshot needs permissions to capture the screen. To fix the error on Ubuntu 26

Flameshot unable to capture screen

1. Install Flatpack with
   sudo apt install flatpak
2. Set the missing permissions with (this is a long command, execute it as one line)
   flatpak permission-set screenshot screenshot org.flameshot.Flameshot yes