When Linux boots, it goes though all the stages of booting, loading the kernel, initializing the initramfs and devices, system initialization and target execution to the Operating System (OS) loaded. The Greeter appears to allow the user to log into the OS. The Greeter not shows the prompt to allow the user the ability to enter a username and password, but also lets the user select a Desktop Environment. You can choose the Accessibility options. As we've been going over articles about the... https://www.linux.org/threads/choos...ddm-slim-lightdm-gtk-and-gdm-explained.57436/