Ubuntu 18.04 LTS will ship with Xorg as the default display server — not Wayland. Canonical cite Xorg’s stability and reliability as the primary reasons behind the about-turn. ‘If you currently use Wayland, and want to keep using it in 18.04 LTS, you absolutely can!

Does Ubuntu use Wayland?

The upcoming Ubuntu 21.04 release will use Wayland as its default display server. … Ubuntu developers made Wayland the default session in Ubuntu 17.10 (which was, notably, the first version of the system to use the GNOME Shell desktop).

Does Ubuntu 18.04 use Wayland?

The default Ubuntu 18.04 Bionic Beaver installation comes with Wayland enabled. The objective is to disable Wayland and enable Xorg display server instead.