Lubuntu 16.10: How to make login through greeter without typing password work
Solution 1:
Here is one more to try. This is from a 16.04 system, not 16.10 but is proven to work there. This is the complete contents of my lightdm.conf file.
[Seat:*]
autologin-guest = false
autologin-user = user2
autologin-user-timeout = 0
[SeatDefaults]
allow-guest = false
Here is a complete lightdm.conf from a different 16.04 system, which also works.
[SeatDefaults]
autologin-user = user2
autologin-user-timeout = 0
user-session = Lubuntu
greeter-session = lightdm-gtk-greeter
allow-guest = false