/usr/lib/systemd/user/unity-screen-locked.target is in unity-services 7.5.0+18.04.20180413-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Description=A target that, when running, represents the screen being locked
Requires=unity7.service
Wants=unity-panel-service-lockscreen.service
PartOf=graphical-session.target
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