alessio@Jericho:~$ ps aux | grep lightdm 
root      1326  0.0  0.3  42316  7448 ?        Ssl  11:15   0:00 lightdm
root      1343  3.6  1.4 117552 28700 tty7     Ss+  11:15   1:02 /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
root      1350  0.0  0.1  18012  3504 ?        Sl   11:15   0:00 lightdm --session-child 12 15
alessio   2926  0.0  0.0   5920   820 pts/0    S+   11:43   0:00 grep --color=auto lightdm