gistfile1.txt

pip install --upgrade pip
ERROR: Exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/_internal/cli/base_command.py", line 186, in _main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/_internal/commands/install.py", line 357, in run
    resolver.resolve(requirement_set)
  File "/usr/lib/python3/dist-packages/pip/_internal/legacy_resolve.py", line 177, in resolve
    discovered_reqs.extend(self._resolve_one(requirement_set, req))
  File "/usr/lib/python3/dist-packages/pip/_internal/legacy_resolve.py", line 333, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "/usr/lib/python3/dist-packages/pip/_internal/legacy_resolve.py", line 270, in _get_abstract_dist_for
    skip_reason = self._check_skip_installed(req)
  File "/usr/lib/python3/dist-packages/pip/_internal/legacy_resolve.py", line 246, in _check_skip_installed
    self.finder.find_requirement(req_to_install, upgrade=True)
  File "/usr/lib/python3/dist-packages/pip/_internal/index/package_finder.py", line 898, in find_requirement
    best_candidate_result = self.find_best_candidate(
  File "/usr/lib/python3/dist-packages/pip/_internal/index/package_finder.py", line 881, in find_best_candidate
    candidates = self.find_all_candidates(project_name)
  File "/usr/lib/python3/dist-packages/pip/_internal/index/package_finder.py", line 825, in find_all_candidates
    package_links = self.process_project_url(
  File "/usr/lib/python3/dist-packages/pip/_internal/index/package_finder.py", line 790, in process_project_url
    html_page = self._link_collector.fetch_page(project_url)
  File "/usr/lib/python3/dist-packages/pip/_internal/index/collector.py", line 497, in fetch_page
    return _get_html_page(location, session=self.session)
  File "/usr/lib/python3/dist-packages/pip/_internal/index/collector.py", line 337, in _get_html_page
    resp = _get_html_response(url, session=session)
  File "/usr/lib/python3/dist-packages/pip/_internal/index/collector.py", line 126, in _get_html_response
    resp = session.get(
  File "/usr/share/python-wheels/requests-2.22.0-py2.py3-none-any.whl/requests/sessions.py", line 546, in get
    return self.request('GET', url, **kwargs)
  File "/usr/lib/python3/dist-packages/pip/_internal/network/session.py", line 405, in request
    return super(PipSession, self).request(method, url, *args, **kwargs)
  File "/usr/share/python-wheels/requests-2.22.0-py2.py3-none-any.whl/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/share/python-wheels/requests-2.22.0-py2.py3-none-any.whl/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/usr/share/python-wheels/CacheControl-0.12.6-py2.py3-none-any.whl/cachecontrol/adapter.py", line 53, in send
    resp = super(CacheControlAdapter, self).send(request, **kw)
  File "/usr/share/python-wheels/requests-2.22.0-py2.py3-none-any.whl/requests/adapters.py", line 439, in send
    resp = conn.urlopen(
  File "/usr/share/python-wheels/urllib3-1.25.8-py2.py3-none-any.whl/urllib3/connectionpool.py", line 665, in urlopen
    httplib_response = self._make_request(
  File "/usr/share/python-wheels/urllib3-1.25.8-py2.py3-none-any.whl/urllib3/connectionpool.py", line 376, in _make_request
    self._validate_conn(conn)
  File "/usr/share/python-wheels/urllib3-1.25.8-py2.py3-none-any.whl/urllib3/connectionpool.py", line 996, in _validate_conn
    conn.connect()
  File "/usr/share/python-wheels/urllib3-1.25.8-py2.py3-none-any.whl/urllib3/connection.py", line 366, in connect
    self.sock = ssl_wrap_socket(
  File "/usr/share/python-wheels/urllib3-1.25.8-py2.py3-none-any.whl/urllib3/util/ssl_.py", line 336, in ssl_wrap_socket
    context.load_verify_locations(ca_certs, ca_cert_dir)
  File "/usr/share/python-wheels/urllib3-1.25.8-py2.py3-none-any.whl/urllib3/contrib/pyopenssl.py", line 453, in load_verify_locations
    self._ctx.load_verify_locations(cafile, capath)
  File "/usr/lib/python3/dist-packages/OpenSSL/SSL.py", line 776, in load_verify_locations
    _raise_current_error()
  File "/usr/lib/python3/dist-packages/OpenSSL/_util.py", line 54, in exception_from_error_queue
    raise exception_type(errors)
OpenSSL.SSL.Error: [('x509 certificate routines', 'X509_load_cert_crl_file', 'no certificate or crl found')]