/usr/share/dovecot/ is in dovecot-core 1:2.2.9-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/dovecot/conf.d/
/usr/share/dovecot/conf.d/10-auth.conf
/usr/share/dovecot/conf.d/10-director.conf
/usr/share/dovecot/conf.d/10-logging.conf
/usr/share/dovecot/conf.d/10-mail.conf
/usr/share/dovecot/conf.d/10-master.conf
/usr/share/dovecot/conf.d/10-ssl.conf
/usr/share/dovecot/conf.d/10-tcpwrapper.conf
/usr/share/dovecot/conf.d/15-lda.conf
/usr/share/dovecot/conf.d/15-mailboxes.conf
/usr/share/dovecot/conf.d/90-acl.conf
/usr/share/dovecot/conf.d/90-plugin.conf
/usr/share/dovecot/conf.d/90-quota.conf
/usr/share/dovecot/conf.d/90-sieve-extprograms.conf
/usr/share/dovecot/conf.d/auth-checkpassword.conf.ext
/usr/share/dovecot/conf.d/auth-deny.conf.ext
/usr/share/dovecot/conf.d/auth-dict.conf.ext
/usr/share/dovecot/conf.d/auth-master.conf.ext
/usr/share/dovecot/conf.d/auth-passwdfile.conf.ext
/usr/share/dovecot/conf.d/auth-sql.conf.ext
/usr/share/dovecot/conf.d/auth-static.conf.ext
/usr/share/dovecot/conf.d/auth-system.conf.ext
/usr/share/dovecot/conf.d/auth-vpopmail.conf.ext
/usr/share/dovecot/dovecot-dict-auth.conf.ext
/usr/share/dovecot/dovecot-dict-sql.conf.ext
/usr/share/dovecot/dovecot-sql.conf.ext
/usr/share/dovecot/dovecot.conf
/usr/share/dovecot/protocols.d/