I asked on forum awhile back and got this way. (didn't suit me, had 2 users, but now got wife own tablet!)
It lets me turn on the computer, go into kitchen (or wherever) and comeback to a already to use desktop. No login screen at all.
Edit your Daemon file as below
gksu gedit /etc/gdm3/daemon.conf
and add the lines below daemon
P.S. can still find thread on forums search for "auto login lmde"