/usr/ is in php-symfony-proxy-manager-bridge 2.7.10-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/
/usr/share/doc/php-symfony-proxy-manager-bridge/
/usr/share/
/usr/share/php/
/usr/share/php/Symfony/
/usr/share/php/Symfony/Bridge/
/usr/share/php/Symfony/Bridge/ProxyManager/
/usr/share/php/Symfony/Bridge/ProxyManager/LazyProxy/
/usr/share/php/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/
/usr/share/php/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php
/usr/share/php/Symfony/Bridge/ProxyManager/LazyProxy/Instantiator/
/usr/share/php/Symfony/Bridge/ProxyManager/LazyProxy/Instantiator/RuntimeInstantiator.php
/usr/share/php/Symfony/Bridge/ProxyManager/autoload.php
/usr/share/doc/php-symfony-proxy-manager-bridge/copyright
/usr/share/doc/php-symfony-proxy-manager-bridge/changelog.Debian.gz
/usr/share/doc/php-symfony-proxy-manager-bridge/README.Debian