/usr/share/dirsrv/schema/ is in 389-ds-base 1.3.7.10-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/dirsrv/schema/00core.ldif
/usr/share/dirsrv/schema/01core389.ldif
/usr/share/dirsrv/schema/02common.ldif
/usr/share/dirsrv/schema/05rfc2927.ldif
/usr/share/dirsrv/schema/05rfc4523.ldif
/usr/share/dirsrv/schema/05rfc4524.ldif
/usr/share/dirsrv/schema/06inetorgperson.ldif
/usr/share/dirsrv/schema/10automember-plugin.ldif
/usr/share/dirsrv/schema/10dna-plugin.ldif
/usr/share/dirsrv/schema/10mep-plugin.ldif
/usr/share/dirsrv/schema/10rfc2307.ldif
/usr/share/dirsrv/schema/20subscriber.ldif
/usr/share/dirsrv/schema/25java-object.ldif
/usr/share/dirsrv/schema/28pilot.ldif
/usr/share/dirsrv/schema/30ns-common.ldif
/usr/share/dirsrv/schema/50ns-admin.ldif
/usr/share/dirsrv/schema/50ns-certificate.ldif
/usr/share/dirsrv/schema/50ns-directory.ldif
/usr/share/dirsrv/schema/50ns-mail.ldif
/usr/share/dirsrv/schema/50ns-value.ldif
/usr/share/dirsrv/schema/50ns-web.ldif
/usr/share/dirsrv/schema/60acctpolicy.ldif
/usr/share/dirsrv/schema/60autofs.ldif
/usr/share/dirsrv/schema/60eduperson.ldif
/usr/share/dirsrv/schema/60mozilla.ldif
/usr/share/dirsrv/schema/60nss-ldap.ldif
/usr/share/dirsrv/schema/60pam-plugin.ldif
/usr/share/dirsrv/schema/60posix-winsync-plugin.ldif
/usr/share/dirsrv/schema/60pureftpd.ldif
/usr/share/dirsrv/schema/60rfc2739.ldif
/usr/share/dirsrv/schema/60rfc3712.ldif
/usr/share/dirsrv/schema/60sabayon.ldif
/usr/share/dirsrv/schema/60sudo.ldif
/usr/share/dirsrv/schema/60trust.ldif