Thanks for your reply
Narcis.
However it seems that on first boot, debian live does not launch lightdm but launches lxde directly.
In fact, when I log out, I go back to tty.
I have lightdm configured with the below:
session-cleanup-script=systemctl restart lightdm
However, this applies only when you launch lightdm and then login and not when you launch lxde directly like I feel is being done in the case of Debian Live by default.
I want to find a way to call lightdm on autologin by user and not lxde.
Not sure if you understood me well.