/usr/share/lintian/overrides/realmd is in realmd 0.16.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # This service is D-Bus activated
realmd: systemd-service-file-missing-install-key lib/systemd/system/realmd.service
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