/usr/share/perl5/CPANPLUS/Internals/ is in libcpanplus-perl 0.9156-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/CPANPLUS/Internals/Constants/
/usr/share/perl5/CPANPLUS/Internals/Constants.pm
/usr/share/perl5/CPANPLUS/Internals/Constants/Report.pm
/usr/share/perl5/CPANPLUS/Internals/Extract.pm
/usr/share/perl5/CPANPLUS/Internals/Fetch.pm
/usr/share/perl5/CPANPLUS/Internals/Report.pm
/usr/share/perl5/CPANPLUS/Internals/Search.pm
/usr/share/perl5/CPANPLUS/Internals/Source/
/usr/share/perl5/CPANPLUS/Internals/Source.pm
/usr/share/perl5/CPANPLUS/Internals/Source/Memory.pm
/usr/share/perl5/CPANPLUS/Internals/Source/SQLite/
/usr/share/perl5/CPANPLUS/Internals/Source/SQLite.pm
/usr/share/perl5/CPANPLUS/Internals/Source/SQLite/Tie.pm
/usr/share/perl5/CPANPLUS/Internals/Utils/
/usr/share/perl5/CPANPLUS/Internals/Utils.pm
/usr/share/perl5/CPANPLUS/Internals/Utils/Autoflush.pm