/usr/share/lintian/overrides/drupal6 is in drupal6 6.22-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | drupal6: package-contains-upstream-install-documentation usr/share/doc/drupal6/INSTALL.mysql.txt
drupal6: package-contains-upstream-install-documentation usr/share/doc/drupal6/INSTALL.pgsql.txt
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