/usr/share/php/Symfony/Component/Validator/Exception/ is in php-symfony-validator 2.7.10-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/Validator/Exception/BadMethodCallException.php
/usr/share/php/Symfony/Component/Validator/Exception/ConstraintDefinitionException.php
/usr/share/php/Symfony/Component/Validator/Exception/ExceptionInterface.php
/usr/share/php/Symfony/Component/Validator/Exception/GroupDefinitionException.php
/usr/share/php/Symfony/Component/Validator/Exception/InvalidArgumentException.php
/usr/share/php/Symfony/Component/Validator/Exception/InvalidOptionsException.php
/usr/share/php/Symfony/Component/Validator/Exception/MappingException.php
/usr/share/php/Symfony/Component/Validator/Exception/MissingOptionsException.php
/usr/share/php/Symfony/Component/Validator/Exception/NoSuchMetadataException.php
/usr/share/php/Symfony/Component/Validator/Exception/OutOfBoundsException.php
/usr/share/php/Symfony/Component/Validator/Exception/RuntimeException.php
/usr/share/php/Symfony/Component/Validator/Exception/UnexpectedTypeException.php
/usr/share/php/Symfony/Component/Validator/Exception/UnsupportedMetadataException.php
/usr/share/php/Symfony/Component/Validator/Exception/ValidatorException.php