1

I have noticed that echo $DISPLAY on Ubuntu 18.04 LTS prints :1 The same command on Ubuntu 16.04 prints :0 Why it has been changed ?

2

For security reasons, and Wayland porting reasons, [GNOME] now launch the X server and Wayland server within the user's session, instead of starting one as root.

The way that we do this is that we launch two X servers, one for the gdm greeter session, and for the session user.

https://askubuntu.com/questions/910108/why-is-my-gdm-at-a-different-tty-than-my-desktop-environment

Ubuntu Desktop 18.04 supports running a Wayland session, even though it is not the default.

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