Openstack and neutron failing: Versioning for this project requires either an sdist tarball, or access to an upstream git repository

Question

I have already tried the Stack Overflow solution 58854822 (python setup.py sdist error Versioning for this project requires either an sdist tarball, or access to an upstream git repository).

The solution at https://www.roaet.com/uncategorized/problem-with-pbr-and-sdist-tarball/ also no longer works.

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I'm running Ubuntu 20.04.

Trying to install an all-in-one with a single network card using the instructions here and here. Openstack (devstack) installs and works fine if I do not include the lines in local.conf which use neutron (I.e. nothing below the ## Neutron options line ... but, of course, then it won't work with the single NIC.

The error I get is ...

Obtaining file:///opt/stack/keystone
    ERROR: Command errored out with exit status 1:
     command: /usr/bin/python3.8 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/opt/stack/keystone/setup.py'"'"'; __file__='"'"'/opt/stack/keystone/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info
         cwd: /opt/stack/keystone/
    Complete output (16 lines):
    Error parsing
    Traceback (most recent call last):
      File "/usr/local/lib/python3.8/dist-packages/pbr/core.py", line 111, in pbr
        attrs = util.cfg_to_args(path, dist.script_args)
      File "/usr/local/lib/python3.8/dist-packages/pbr/util.py", line 272, in cfg_to_args
        pbr.hooks.setup_hook(config)
      File "/usr/local/lib/python3.8/dist-packages/pbr/hooks/__init__.py", line 25, in setup_hook
        metadata_config.run()
      File "/usr/local/lib/python3.8/dist-packages/pbr/hooks/base.py", line 27, in run
        self.hook()
      File "/usr/local/lib/python3.8/dist-packages/pbr/hooks/metadata.py", line 25, in hook
        self.config['version'] = packaging.get_version(
      File "/usr/local/lib/python3.8/dist-packages/pbr/packaging.py", line 872, in get_version
        raise Exception("Versioning for this project requires either an sdist"
    Exception: Versioning for this project requires either an sdist tarball, or access to an upstream git repository. It's also possible that there is a mismatch between the package name in setup.cfg and the argument given to pbr.version.VersionInfo. Project name keystone was given, but was not able to be found.
    error in setup command: Error parsing /opt/stack/keystone/setup.cfg: Exception: Versioning for this project requires either an sdist tarball, or access to an upstream git repository. It's also possible that there is a mismatch between the package name in setup.cfg and the argument given to pbr.version.VersionInfo. Project name keystone was given, but was not able to be found.
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

My local.conf looks like...

HOST_IP=192.168.68.111
SERVICE_HOST=192.168.68.111
MYSQL_HOST=192.168.68.111
RABBIT_HOST=192.168.68.111
GLANCE_HOSTPORT=192.168.68.111:9292
ADMIN_PASSWORD=secret
DATABASE_PASSWORD=secret
RABBIT_PASSWORD=secret
SERVICE_PASSWORD=secret

## Neutron options
Q_USE_SECGROUP=True
FLOATING_RANGE="192.168.68.0/24"
IPV4_ADDRS_SAFE_TO_USE="10.0.0.0/22"
Q_FLOATING_ALLOCATION_POOL=start=192.168.68.250,end=192.168.68.254
PUBLIC_NETWORK_GATEWAY="192.168.68.1"
PUBLIC_INTERFACE=ens33

# Open vSwitch provider networking configuration
Q_USE_PROVIDERNET_FOR_PUBLIC=True
OVS_PHYSICAL_BRIDGE=br-ex
PUBLIC_BRIDGE=br-ex
OVS_BRIDGE_MAPPINGS=public:br-ex

I've even tried installing all the Python modules from the /opt/stack/requirements/upper-constraints.txt manually, but it makes no difference. I have also tried installing the Keystone repo separately, with the same error.