/usr/lib/x86_64-linux-gnu/ is in libgtk2-unique-perl 0.05-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/perl5/
/usr/lib/x86_64-linux-gnu/perl5/5.22/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/UniqueApp.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Unique.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/UniqueBackend.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/UniqueMessageData.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Unique.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Unique/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Unique/Install/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Unique/Install/Files.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Unique/Install/unique-autogen.h
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Unique/Install/unique.typemap
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Unique/Install/unique-perl.h
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Unique/index.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Gtk2/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Gtk2/Unique/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Gtk2/Unique/Unique.so