/usr/share/ is in drupal6-mod-trackback 1.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/drupal6/
/usr/share/drupal6/modules/
/usr/share/drupal6/modules/trackback/
/usr/share/drupal6/modules/trackback/trackback.ping.inc
/usr/share/drupal6/modules/trackback/drupal6-mod-trackback-1.2/
/usr/share/drupal6/modules/trackback/drupal6-mod-trackback-1.2/translations/
/usr/share/drupal6/modules/trackback/trackback.info
/usr/share/drupal6/modules/trackback/trackback.admin.inc
/usr/share/drupal6/modules/trackback/trackback.install
/usr/share/drupal6/modules/trackback/trackback.spam.inc
/usr/share/drupal6/modules/trackback/translations/
/usr/share/drupal6/modules/trackback/translations/trackback.pot
/usr/share/drupal6/modules/trackback/trackback.module
/usr/share/doc/
/usr/share/doc/drupal6-mod-trackback/
/usr/share/doc/drupal6-mod-trackback/README.txt
/usr/share/doc/drupal6-mod-trackback/copyright