How to solve `CERTIFICATE_VERIFY_FAILED` error when install gcloud?

I tried to install gcloud in MacOs but failed. I tried two python versions 3.7.4 and 3.9.1 but both have the same issue. how can I install the gcloud? Is there any other dependencies I need?

$ python --version
Python 3.9.1

$ sh install.sh --screen-reader=true
Welcome to the Google Cloud SDK!

To help improve the quality of this product, we collect anonymized usage data
and anonymized stacktraces when crashes are encountered; additional information
is available at <https://cloud.google.com/sdk/usage-statistics>. This data is
handled in accordance with our privacy policy
<https://cloud.google.com/terms/cloud-privacy-notice>. You may choose to opt in this
collection now (by choosing 'Y' at the below prompt), or at any time in the
future by running the following command:

    gcloud config set disable_usage_reporting false

Do you want to help improve the Google Cloud SDK (y/N)?  y

Traceback (most recent call last):
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/urllib3/connectionpool.py", line 667, in urlopen
    self._prepare_proxy(conn)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/urllib3/connectionpool.py", line 930, in _prepare_proxy
    conn.connect()
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/urllib3/connection.py", line 361, in connect
    self.sock = ssl_wrap_socket(
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/urllib3/util/ssl_.py", line 382, in ssl_wrap_socket
    return context.wrap_socket(sock, server_hostname=server_hostname)
  File "/Users/joey/.pyenv/versions/3.9.1/lib/python3.9/ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "/Users/joey/.pyenv/versions/3.9.1/lib/python3.9/ssl.py", line 1040, in _create
    self.do_handshake()
  File "/Users/joey/.pyenv/versions/3.9.1/lib/python3.9/ssl.py", line 1309, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1123)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/requests/adapters.py", line 439, in send
    resp = conn.urlopen(
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/urllib3/connectionpool.py", line 724, in urlopen
    retries = retries.increment(
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/urllib3/util/retry.py", line 439, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='dl.google.com', port=443): Max retries exceeded with url: /dl/cloudsdk/channels/rapid/components-2.json (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1123)')))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/joey/Downloads/google-cloud-sdk/bin/bootstrapping/install.py", line 232, in <module>
    main()
  File "/Users/joey/Downloads/google-cloud-sdk/bin/bootstrapping/install.py", line 210, in main
    Install(pargs.override_components, pargs.additional_components)
  File "/Users/joey/Downloads/google-cloud-sdk/bin/bootstrapping/install.py", line 151, in Install
    _CLI.Execute(['--quiet', 'components', 'list'])
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/calliope/cli.py", line 1008, in Execute
    self._HandleAllErrors(exc, command_path_string, specified_arg_names)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/calliope/cli.py", line 1045, in _HandleAllErrors
    exceptions.HandleError(exc, command_path_string, self.__known_error_handler)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/calliope/exceptions.py", line 551, in HandleError
    core_exceptions.reraise(exc)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/exceptions.py", line 146, in reraise
    six.reraise(type(exc_value), exc_value, tb)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/six/__init__.py", line 693, in reraise
    raise value
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/calliope/cli.py", line 982, in Execute
    resources = calliope_command.Run(cli=self, args=args)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/calliope/backend.py", line 809, in Run
    resources = command_instance.Run(args)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/surface/components/list.py", line 102, in Run
    result = update_manager.List(show_hidden=args.show_hidden,
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/updater/update_manager.py", line 714, in List
    to_print, current_version, latest_version = self._GetPrintListWithDiff()
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/updater/update_manager.py", line 750, in _GetPrintListWithDiff
    _, diff = self._GetStateAndDiff(command_path='components.list')
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/updater/update_manager.py", line 641, in _GetStateAndDiff
    latest_snapshot = self._GetLatestSnapshot(version=version,
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/updater/update_manager.py", line 624, in _GetLatestSnapshot
    return snapshots.ComponentSnapshot.FromURLs(
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/updater/snapshots.py", line 178, in FromURLs
    data = [
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/updater/snapshots.py", line 179, in <listcomp>
    (ComponentSnapshot._DictFromURL(
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/updater/snapshots.py", line 204, in _DictFromURL
    response = installers.MakeRequestViaRequests(url, command_path)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/updater/installers.py", line 203, in MakeRequestViaRequests
    return _RawRequestViaRequests(url, headers=headers, timeout=timeout)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/updater/installers.py", line 251, in _RawRequestViaRequests
    return retryer.RetryOnException(
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/util/retry.py", line 195, in RetryOnException
    exceptions.reraise(exc_info[1], tb=exc_info[2])
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/exceptions.py", line 146, in reraise
    six.reraise(type(exc_value), exc_value, tb)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/six/__init__.py", line 693, in reraise
    raise value
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/util/retry.py", line 176, in TryFunc
    return func(*args, **kwargs), None
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/updater/installers.py", line 281, in _ExecuteRequestAndRaiseExceptions
    response = requests_session.get(
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/requests/sessions.py", line 546, in get
    return self.request('GET', url, **kwargs)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/transport.py", line 243, in WrappedRequest
    response = orig_request(*modified_args, **modified_kwargs)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/googlecloudsdk/core/requests.py", line 198, in WrappedRequest
    return orig_request_method(*args, **kwargs)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/Users/joey/Downloads/google-cloud-sdk/lib/third_party/requests/adapters.py", line 514, in send
    raise SSLError(e, request=request)
requests.exceptions.SSLError: HTTPSConnectionPool(host='dl.google.com', port=443): Max retries exceeded with url: /dl/cloudsdk/channels/rapid/components-2.json (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1123)')))

Answer

There could be many possible reasons for this error, proxy configuration would be the one but as you mentioned you have no proxy configured to your network so, the cause could be something else. In order to Authenticate whether this error has occurred due to proxy or not, you can try running below commands:

$ curl https://dl.google.com/

Output: <a href="https://www.google.com/chrome"> Found  </a>

If you get a different output from the above mentioned one then, you’re behind a proxy or portal.

You can refer to this stackoverflow thread, where a cloud support user has given an answer by providing various possible reasons that could cause this SSL error, he has also provided the workaround for resolving this error. Try disabling antivirus settings, if there is any such software installed.