/usr/share/lightdm/lightdm.conf.d/50-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.
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greeter-session=arctica-greeter
### FIXME: disabling the greeter wrapper so far, as systemctl --user calls will fail with the wrapper
### enabled.
#greeter-wrapper=/usr/lib/x86_64-linux-gnu/arctica-greeter/lightdm-arctica-greeter-session
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