I'm following the installation instructions at https://docs.openstack.org/placement/... and all appears to go smoothly. Then at the Verify step, the command "placement-status upgrade check" throws the following exception:

$ placement-status upgrade check
Traceback (most recent call last):
  File "/usr/bin/placement-status", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python3/dist-packages/placement/cmd/status.py", line 131, in main
    config(args=sys.argv[1:], project='placement')
  File "/usr/lib/python3/dist-packages/oslo_config/cfg.py", line 2127, in __call__
    self._check_required_opts()
  File "/usr/lib/python3/dist-packages/oslo_config/cfg.py", line 2865, in _check_required_opts
    raise RequiredOptError(opt.name, group)
oslo_config.cfg.RequiredOptError: value required for option connection in group [placement_database]

I've scanned the [placement_database] section of placement.conf, and the only uncommented line is the 'connection' entry, which is exactly as specified in the installation documentation, except for my own password.

I am trying to upgrade from Queens on Ubuntu 16.0 to Stein on Ubuntu 18.04 and this is the first show-stopper I've encountered. Any help would be apprciated.