/usr/share/php/Horde/Kolab/Storage/Driver/ is in php-horde-kolab-storage 2.2.3-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Horde/Kolab/Storage/Driver/Base.php
/usr/share/php/Horde/Kolab/Storage/Driver/Cclient.php
/usr/share/php/Horde/Kolab/Storage/Driver/Decorator/
/usr/share/php/Horde/Kolab/Storage/Driver/Decorator/Base.php
/usr/share/php/Horde/Kolab/Storage/Driver/Decorator/Log.php
/usr/share/php/Horde/Kolab/Storage/Driver/Decorator/Timer.php
/usr/share/php/Horde/Kolab/Storage/Driver/Imap.php
/usr/share/php/Horde/Kolab/Storage/Driver/Mock/
/usr/share/php/Horde/Kolab/Storage/Driver/Mock.php
/usr/share/php/Horde/Kolab/Storage/Driver/Mock/Data.php
/usr/share/php/Horde/Kolab/Storage/Driver/Pear.php
/usr/share/php/Horde/Kolab/Storage/Driver/Rcube.php