/usr/share/lintian/overrides/shorewall-init is in shorewall-init 4.5.21.6-1.
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 | # Shorewall needs to continue in runlevel 1 because networking may still be up
shorewall-init: init.d-script-possible-missing-stop
# The string "/usr" only occurs in the script because it is in a help message
# directing the user to documentation
shorewall-init: init.d-script-missing-dependency-on-remote_fs
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