/usr/ is in php-horde-text-diff 2.1.2-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/php/
/usr/share/php/Horde/
/usr/share/php/Horde/Text/
/usr/share/php/Horde/Text/Diff/
/usr/share/php/Horde/Text/Diff/Exception.php
/usr/share/php/Horde/Text/Diff/Op/
/usr/share/php/Horde/Text/Diff/Op/Delete.php
/usr/share/php/Horde/Text/Diff/Op/Base.php
/usr/share/php/Horde/Text/Diff/Op/Add.php
/usr/share/php/Horde/Text/Diff/Op/Change.php
/usr/share/php/Horde/Text/Diff/Op/Copy.php
/usr/share/php/Horde/Text/Diff/ThreeWay.php
/usr/share/php/Horde/Text/Diff/Mapped.php
/usr/share/php/Horde/Text/Diff/Engine/
/usr/share/php/Horde/Text/Diff/Engine/Native.php
/usr/share/php/Horde/Text/Diff/Engine/String.php
/usr/share/php/Horde/Text/Diff/Engine/Xdiff.php
/usr/share/php/Horde/Text/Diff/Engine/Shell.php
/usr/share/php/Horde/Text/Diff/Renderer.php
/usr/share/php/Horde/Text/Diff/ThreeWay/
/usr/share/php/Horde/Text/Diff/ThreeWay/Op/
/usr/share/php/Horde/Text/Diff/ThreeWay/Op/Base.php
/usr/share/php/Horde/Text/Diff/ThreeWay/Op/Copy.php
/usr/share/php/Horde/Text/Diff/ThreeWay/BlockBuilder.php
/usr/share/php/Horde/Text/Diff/Renderer/
/usr/share/php/Horde/Text/Diff/Renderer/Context.php
/usr/share/php/Horde/Text/Diff/Renderer/Unified.php
/usr/share/php/Horde/Text/Diff/Renderer/Inline.php
/usr/share/php/Horde/Text/Diff.php
/usr/share/php/.registry/
/usr/share/php/.registry/.channel.pear.horde.org/
/usr/share/php/.registry/.channel.pear.horde.org/horde_text_diff.reg
/usr/share/doc/
/usr/share/doc/php-horde-text-diff/
/usr/share/doc/php-horde-text-diff/examples/
/usr/share/doc/php-horde-text-diff/examples/2.txt
/usr/share/doc/php-horde-text-diff/examples/diff.php
/usr/share/doc/php-horde-text-diff/examples/1.txt
/usr/share/doc/php-horde-text-diff/copyright
/usr/share/doc/php-horde-text-diff/changelog.Debian.gz
/usr/share/doc/php-horde-text-diff/package.xml.gz