/usr/ is in fusionforge-plugin-blocks 6.0.5-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/fusionforge/plugins/blocks/
/usr/share/fusionforge/plugins/blocks/common/
/usr/share/
/usr/share/doc/
/usr/share/doc/fusionforge-plugin-blocks/
/usr/share/doc/fusionforge-plugin-blocks/copyright
/usr/share/fusionforge/
/usr/share/fusionforge/cronjobs/
/usr/share/fusionforge/plugins/
/usr/share/fusionforge/plugins/blocks/common/blocksPlugin.class.php
/usr/share/fusionforge/plugins/blocks/common/blocks_Widget_ProjectSummary.class.php
/usr/share/fusionforge/plugins/blocks/db/
/usr/share/fusionforge/plugins/blocks/db/20120611.sql
/usr/share/fusionforge/plugins/blocks/db/blocks-init.sql
/usr/share/fusionforge/plugins/blocks/etc/
/usr/share/fusionforge/plugins/blocks/etc/blocks.ini
/usr/share/fusionforge/plugins/blocks/www/
/usr/share/fusionforge/plugins/blocks/www/index.php
/usr/share/fusionforge/post-install.d/
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/fusionforge-plugin-blocks
/usr/share/doc/fusionforge-plugin-blocks/changelog.Debian.gz