/etc/lightdm/lightdm.conf.d/90-arctica-greeter.conf is in arctica-greeter 0.99.0.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | [SeatDefaults]
# For real usage of Arctica Greeter as Thin Client login
# system, remove the comment hashes for all options below
# we are very serious, we _want_ Arctica Greeter as LightDM greeter!!!
greeter-session=arctica-greeter
# don't show local user names at Arctica Greeter login prompt
#greeter-hide-users=true
# don neither show a username / password login prompt for local login
greeter-show-manual-login=true
# disable guest sessions (a guest session requires a valid default
# user-session parameter, see below)
#allow-guest=true
# enforce showing remote login feature
greeter-show-remote-login=true
# if on Ubuntu and Unity is not installed, this is a minimal user session type for
# default (guest) sessions (sudo apt-get install openbox)
#user-session=openbox
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