Hi firedrake team, I am installing firedrake on my Ubuntu 14.04 and failed when downloading Eigen due to ssl.SSLCertVerificationError. Some of the error messages are as below, and I’ve attached firedrake-install.log. Any help to fix this would be appreciated. All the best, Hiroe *** Downloading Eigen from 'https://github.com/eigenteam/eigen-git-mirror/archive/3.3.3.tar.gz' to 'eigen-3.3.3.tgz' Traceback (most recent call last): File "/usr/local/lib/python3.7/urllib/request.py", line 1317, in do_open encode_chunked=req.has_header('Transfer-encoding')) File "/usr/local/lib/python3.7/http/client.py", line 1229, in request self._send_request(method, url, body, headers, encode_chunked) File "/usr/local/lib/python3.7/http/client.py", line 1275, in _send_request self.endheaders(body, encode_chunked=encode_chunked) File "/usr/local/lib/python3.7/http/client.py", line 1224, in endheaders self._send_output(message_body, encode_chunked=encode_chunked) File "/usr/local/lib/python3.7/http/client.py", line 1016, in _send_output self.send(msg) File "/usr/local/lib/python3.7/http/client.py", line 956, in send self.connect() File "/usr/local/lib/python3.7/http/client.py", line 1392, in connect server_hostname=server_hostname) File "/usr/local/lib/python3.7/ssl.py", line 412, in wrap_socket session=session File "/usr/local/lib/python3.7/ssl.py", line 850, in _create self.do_handshake() File "/usr/local/lib/python3.7/ssl.py", line 1108, in do_handshake self._sslobj.do_handshake() ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1045) During handling of the above exception, another exception occurred: Traceback (most recent call last): File "firedrake-install", line 1649, in <module> install("petsc/") File "firedrake-install", line 882, in install build_and_install_petsc() File "firedrake-install", line 995, in build_and_install_petsc urllib.request.urlretrieve(url, filename=tarball) File "/usr/local/lib/python3.7/urllib/request.py", line 247, in urlretrieve with contextlib.closing(urlopen(url, data)) as fp: File "/usr/local/lib/python3.7/urllib/request.py", line 222, in urlopen return opener.open(url, data, timeout) File "/usr/local/lib/python3.7/urllib/request.py", line 525, in open response = self._open(req, data) File "/usr/local/lib/python3.7/urllib/request.py", line 543, in _open '_open', req) File "/usr/local/lib/python3.7/urllib/request.py", line 503, in _call_chain result = func(*args) File "/usr/local/lib/python3.7/urllib/request.py", line 1360, in https_open context=self._context, check_hostname=self._check_hostname) File "/usr/local/lib/python3.7/urllib/request.py", line 1319, in do_open raise URLError(err) urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1045)> ***