Check Ubuntu Desktop environment type

hugo@lenovo:~$ loginctl
   SESSION        UID USER             SEAT             TTY             
        c1        121 gdm              seat0            tty1            
         2       1000 hugo             seat0            tty2            

2 sessions listed.
hugo@lenovo:~$ loginctl show-session 2 -p Type
Type=wayland
hugo@lenovo:~$