/usr/share/php/ is in php-horde-group 2.1.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Horde/
/usr/share/php/Horde/Group/
/usr/share/php/Horde/Group/Sql.php
/usr/share/php/Horde/Group/Exception.php
/usr/share/php/Horde/Group/Mock.php
/usr/share/php/Horde/Group/Base.php
/usr/share/php/Horde/Group/Kolab.php
/usr/share/php/Horde/Group/Ldap.php
/usr/share/php/data/
/usr/share/php/data/Horde_Group/
/usr/share/php/data/Horde_Group/migration/
/usr/share/php/data/Horde_Group/migration/1_horde_group_base_tables.php
/usr/share/php/data/Horde_Group/migration/2_horde_group_upgrade_autoincrement.php
/usr/share/php/data/Horde_Group/migration/3_horde_group_upgrade_null_parents.php
/usr/share/php/.registry/
/usr/share/php/.registry/.channel.pear.horde.org/
/usr/share/php/.registry/.channel.pear.horde.org/horde_group.reg