Problems with updating anaconda and installing new packages

Question

I am trying to install seaborn on anaconda on Ubuntu-Linux.

conda install -c anaconda seaborn=0.7.1

I am getting the following error message:

Fetching package metadata .../home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/packages/urllib3/connection.py:337: SubjectAltNameWarning: Certificate for conda.anaconda.org has no `subjectAltName`, falling back to check for a `commonName` for now. This feature is being removed by major browsers and deprecated by RFC 2818. (See https://github.com/shazow/urllib3/issues/497 for details.)
  SubjectAltNameWarning
/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/packages/urllib3/connection.py:337: SubjectAltNameWarning: Certificate for conda.anaconda.org has no `subjectAltName`, falling back to check for a `commonName` for now. This feature is being removed by major browsers and deprecated by RFC 2818. (See https://github.com/shazow/urllib3/issues/497 for details.)
  SubjectAltNameWarning
..An unexpected error has occurred.
Please consider posting the following information to the
conda GitHub issue tracker at:

    https://github.com/conda/conda/issues

Current conda install:

           platform : linux-64
      conda version : 4.2.12
   conda is private : False
  conda-env version : 4.2.12
conda-build version : 1.19.0
     python version : 3.5.2.final.0
   requests version : 2.12.1
   root environment : /home/moritz/Python/anaconda3  (writable)
default environment : /home/moritz/Python/anaconda3
   envs directories : /home/moritz/Python/anaconda3/envs
      package cache : /home/moritz/Python/anaconda3/pkgs
       channel URLs : https://repo.continuum.io/pkgs/free/linux-64
                      https://repo.continuum.io/pkgs/free/noarch
                      https://repo.continuum.io/pkgs/pro/linux-64
                      https://repo.continuum.io/pkgs/pro/noarch
        config file : None
       offline mode : False

When I run

$ /home/moritz/Python/anaconda3/bin/conda install -c anaconda seaborn=0.7.1

I am getting the following error message:

Traceback (most recent call last):
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/conda/exceptions.py", line 479, in conda_exception_handler
    return_value = func(*args, **kwargs)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/conda/cli/main.py", line 145, in _main
    exit_code = args.func(args, p)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/conda/cli/main_install.py", line 80, in execute
    install(args, parser, 'install')
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/conda/cli/install.py", line 238, in install
    prefix=prefix)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/conda/api.py", line 24, in get_index
    index = fetch_index(channel_urls, use_cache=use_cache, unknown=unknown)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/conda/fetch.py", line 310, in fetch_index
    repodatas = [(u, f.result()) for u, f in zip(urls, futures)]
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/conda/fetch.py", line 310, in <listcomp>
    repodatas = [(u, f.result()) for u, f in zip(urls, futures)]
  File "/home/moritz/Python/anaconda3/lib/python3.5/concurrent/futures/_base.py", line 398, in result
    return self.__get_result()
  File "/home/moritz/Python/anaconda3/lib/python3.5/concurrent/futures/_base.py", line 357, in __get_result
    raise self._exception
  File "/home/moritz/Python/anaconda3/lib/python3.5/concurrent/futures/thread.py", line 55, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/conda/fetch.py", line 74, in func
    res = f(*args, **kwargs)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/conda/fetch.py", line 116, in fetch_repodata
    timeout=(3.05, 60))
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/sessions.py", line 501, in get
    return self.request('GET', url, **kwargs)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/sessions.py", line 488, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/sessions.py", line 609, in send
    r = adapter.send(request, **kwargs)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/adapters.py", line 423, in send
    timeout=timeout
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 594, in urlopen
    chunked=chunked)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 350, in _make_request
    self._validate_conn(conn)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 835, in _validate_conn
    conn.connect()
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/packages/urllib3/connection.py", line 330, in connect
    cert = self.sock.getpeercert()
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/packages/urllib3/contrib/pyopenssl.py", line 324, in getpeercert
    'subjectAltName': get_subj_alt_name(x509)
  File "/home/moritz/Python/anaconda3/lib/python3.5/site-packages/requests/packages/urllib3/contrib/pyopenssl.py", line 171, in get_subj_alt_name
    ext = cert.extensions.get_extension_for_class(
AttributeError: 'Extensions' object has no attribute 'get_extension_for_class'`

Any idea what the issue could be here? Many thanks in advance.

Answer 1

please see here: https://github.com/conda/conda/issues/3929

The issue was an old version of the cryptography package. It could be fixed by running:

CONDA_SSL_VERIFY=false conda update pyopenssl

Answer 2

Another way to disable verification of SSL certificates that will work on Windows as well:

add ssl_verify: False to .condarc file.

.condarc file is not included by default, but it is automatically created in the user's home directory the first time you run the conda config command.

To set ssl_verify the following command can be used:

conda config --set ssl_verify False .