/usr/share/php/ProxyManager/Generator/ is in php-proxy-manager 2.0.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/ProxyManager/Generator/ClassGenerator.php
/usr/share/php/ProxyManager/Generator/MagicMethodGenerator.php
/usr/share/php/ProxyManager/Generator/MethodGenerator.php
/usr/share/php/ProxyManager/Generator/Util/
/usr/share/php/ProxyManager/Generator/Util/ClassGeneratorUtils.php
/usr/share/php/ProxyManager/Generator/Util/UniqueIdentifierGenerator.php
/usr/share/php/ProxyManager/GeneratorStrategy/BaseGeneratorStrategy.php
/usr/share/php/ProxyManager/GeneratorStrategy/EvaluatingGeneratorStrategy.php
/usr/share/php/ProxyManager/GeneratorStrategy/FileWriterGeneratorStrategy.php
/usr/share/php/ProxyManager/GeneratorStrategy/GeneratorStrategyInterface.php