Ubuntu: removing guest access and removing remote login

Ubuntu ≥ 17.10 uses a different login system than described below.

Ubuntu 14.04 - 17.04

mkdir -p /etc/lightdm/lightdm.conf.d

add to /etc/lightdm/lightdm.conf.d/50-unity-greeter.conf

[SeatDefaults] 
allow-guest=false 
greeter-show-remote-login=false

Ubuntu 12.04

Add lines above to /etc/lightdm/lightdm.conf

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