/usr/ is in libcrypt-u2f-server-perl 0.40-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/perl5/
/usr/lib/x86_64-linux-gnu/perl5/5.26/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Crypt/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Crypt/U2F/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Crypt/U2F/Server/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Crypt/U2F/Server/Simple.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/Crypt/U2F/Server.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Crypt/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Crypt/U2F/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Crypt/U2F/Server/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Crypt/U2F/Server/Server.so
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Crypt/U2F/Server/autosplit.ix
/usr/share/
/usr/share/doc/
/usr/share/doc/libcrypt-u2f-server-perl/
/usr/share/doc/libcrypt-u2f-server-perl/changelog.Debian.gz
/usr/share/doc/libcrypt-u2f-server-perl/copyright
/usr/share/doc/libcrypt-u2f-server-perl/examples/
/usr/share/doc/libcrypt-u2f-server-perl/examples/u2fsimple_authenticate.pl
/usr/share/doc/libcrypt-u2f-server-perl/examples/u2fsimple_authenticate_replyonly.pl
/usr/share/doc/libcrypt-u2f-server-perl/examples/u2fsimple_authenticate_requestonly.pl
/usr/share/doc/libcrypt-u2f-server-perl/examples/u2fsimple_register.pl
/usr/share/man/
/usr/share/man/man3/
/usr/share/man/man3/Crypt::U2F::Server.3pm.gz
/usr/share/man/man3/Crypt::U2F::Server::Simple.3pm.gz