Additional system information:
$ echo $XDG_SESSION_TYPE x11
$ ls -l /usr/share/xsessions/ | awk '{print $9}' | grep -v '^\.' ubuntu.desktop ubuntu-xorg.desktop unity.desktop
$ gnome-shell --version GNOME Shell 42.5
So, not running Wayland.
Additional system information:
$ echo $XDG_SESSION_TYPE
x11
$ ls -l /usr/share/ xsessions/ | awk '{print $9}' | grep -v '^\.' xorg.desktop
ubuntu.desktop
ubuntu-
unity.desktop
$ gnome-shell --version
GNOME Shell 42.5
So, not running Wayland.