The ongodb-org[-unstable] deb metapackage includes a /var/lib/mongodb directory owned by root. When installing this package, the mongodb-org[-unstable]-server package would
so MongoDB would run.
However, after the changes in
SERVER-23516 the permissions of /var/lib/mongodb are not updated, so the resulting installation will not be usable until those permissions are fixed.
The proposed solution is to remove /var/lib/mongodb from the mongodb-org[-unstable] metapackage.