/usr/share/perl5/Data/Serializer/ is in libdata-serializer-perl 0.60-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Data/Serializer/Bencode.pm
/usr/share/perl5/Data/Serializer/Config/
/usr/share/perl5/Data/Serializer/Config/General.pm
/usr/share/perl5/Data/Serializer/Convert/
/usr/share/perl5/Data/Serializer/Convert/Bencode.pm
/usr/share/perl5/Data/Serializer/Convert/Bencode_XS.pm
/usr/share/perl5/Data/Serializer/Cookbook.pm
/usr/share/perl5/Data/Serializer/Data/
/usr/share/perl5/Data/Serializer/Data/Denter.pm
/usr/share/perl5/Data/Serializer/Data/Dumper.pm
/usr/share/perl5/Data/Serializer/Data/Taxi.pm
/usr/share/perl5/Data/Serializer/FreezeThaw.pm
/usr/share/perl5/Data/Serializer/JSON/
/usr/share/perl5/Data/Serializer/JSON.pm
/usr/share/perl5/Data/Serializer/JSON/Syck.pm
/usr/share/perl5/Data/Serializer/PHP/
/usr/share/perl5/Data/Serializer/PHP/Serialization.pm
/usr/share/perl5/Data/Serializer/Persistent.pm
/usr/share/perl5/Data/Serializer/Raw.pm
/usr/share/perl5/Data/Serializer/Storable.pm
/usr/share/perl5/Data/Serializer/XML/
/usr/share/perl5/Data/Serializer/XML/Dumper.pm
/usr/share/perl5/Data/Serializer/XML/Simple.pm
/usr/share/perl5/Data/Serializer/YAML/
/usr/share/perl5/Data/Serializer/YAML.pm
/usr/share/perl5/Data/Serializer/YAML/Syck.pm