/usr/lib/x86_64-linux-gnu/ is in libtext-bibtex-perl 0.85-1.
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/usr/lib/x86_64-linux-gnu/perl5/5.26/
/usr/lib/x86_64-linux-gnu/perl5/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Text/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Text/BibTeX/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Text/BibTeX/Bib.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/Text/BibTeX/BibFormat.pm
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/usr/lib/x86_64-linux-gnu/perl5/5.26/Text/BibTeX/File.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/Text/BibTeX/Name.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/Text/BibTeX/NameFormat.pm
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/usr/lib/x86_64-linux-gnu/perl5/5.26/Text/BibTeX.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Text/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Text/BibTeX/
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/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Text/BibTeX/BibTeX.so