/usr/lib/dovecot/libdovecot-metadata.so.0 is in dovecot-metadata-plugin 14+20131027-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/dovecot/libdovecot-metadata.so.0.0.0
/usr/lib/dovecot/libdovecot-metadata.so.0.0.0