On Ubuntu 18.04, Running tests with few optional and external packages 
(including internet this time), I obtain

Using 
--optional=4ti2,ccache,cryptominisat,dot2tex,e_antic,external,fricas,glucose,latte_int,libnauty,lidia,lrslib,memlimit,normaliz,notedown,openssl,pandoc_attributes,pycosat,pynormaliz,rst2ipynb,sage,sage_numerical_backends_coin

----------------------------------------------------------------------
sage -t --long --random-seed=0 
src/doc/en/constructions/interface_issues.rst  # 1 doctest failed
sage -t --long --random-seed=0 src/sage/arith/misc.py  # 1 doctest failed
sage -t --long --random-seed=0 
src/sage/combinat/designs/incidence_structures.py  # 1 doctest failed
sage -t --long --random-seed=0 src/sage/databases/oeis.py  # 1 doctest 
failed
sage -t --long --random-seed=0 src/sage/graphs/generic_graph.py  # 2 
doctests failed
sage -t --long --random-seed=0 src/sage/graphs/graph.py  # 3 doctests failed
sage -t --long --random-seed=0 src/sage/lfunctions/sympow.py  # 4 doctests 
failed
sage -t --long --random-seed=0 src/sage/misc/package.py  # 2 doctests failed
sage -t --long --random-seed=0 src/sage/misc/remote_file.py  # 1 doctest 
failed
sage -t --long --random-seed=0 
src/sage/schemes/elliptic_curves/ell_rational_field.py  # 2 doctests failed
sage -t --long --random-seed=0 src/sage/symbolic/integration/external.py  # 
1 doctest failed
sage -t --long --random-seed=0 src/sage/symbolic/integration/integral.py  # 
1 doctest failed
----------------------------------------------------------------------
External software detected for doctesting: 
ffmpeg,graphviz,imagemagick,internet,latex,octave,pandoc


Rerunning the failed tests, I get the same.


I copy paste below the failures:


sage -t --long --random-seed=0 
src/sage/schemes/elliptic_curves/ell_rational_field.py
**********************************************************************
File "src/sage/schemes/elliptic_curves/ell_rational_field.py", line 1496, 
in 
sage.schemes.elliptic_curves.ell_rational_field.EllipticCurve_rational_field.analytic_rank
Failed example:
    E.analytic_rank(algorithm='sympow')
Exception raised:
    Traceback (most recent call last):
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 720, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 1145, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.schemes.elliptic_curves.ell_rational_field.EllipticCurve_rational_field.analytic_rank[3]>",
 
line 1, in <module>
        E.analytic_rank(algorithm='sympow')
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/schemes/elliptic_curves/ell_rational_field.py",
 
line 1551, in analytic_rank
        return sympow.analytic_rank(self)[0]
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/lfunctions/sympow.py",
 
line 299, in analytic_rank
        raise RuntimeError("failed to compute analytic rank")
    RuntimeError: failed to compute analytic rank
**********************************************************************
File "src/sage/schemes/elliptic_curves/ell_rational_field.py", line 1502, 
in 
sage.schemes.elliptic_curves.ell_rational_field.EllipticCurve_rational_field.analytic_rank
Failed example:
    E.analytic_rank(algorithm='all')
Exception raised:
    Traceback (most recent call last):
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 720, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 1145, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.schemes.elliptic_curves.ell_rational_field.EllipticCurve_rational_field.analytic_rank[5]>",
 
line 1, in <module>
        E.analytic_rank(algorithm='all')
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/schemes/elliptic_curves/ell_rational_field.py",
 
line 1567, in analytic_rank
        self.analytic_rank('rubinstein'), self.analytic_rank('sympow')])
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/schemes/elliptic_curves/ell_rational_field.py",
 
line 1551, in analytic_rank
        return sympow.analytic_rank(self)[0]
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/lfunctions/sympow.py",
 
line 299, in analytic_rank
        raise RuntimeError("failed to compute analytic rank")
    RuntimeError: failed to compute analytic rank
**********************************************************************
1 item had failures:
   2 of  14 in 
sage.schemes.elliptic_curves.ell_rational_field.EllipticCurve_rational_field.analytic_rank
    1 database_cremona_ellcurve test not run
    8 magma tests not run
    1 webbrowser test not run
    0 tests not run because we ran out of time
    [849 tests, 2 failures, 86.03 s]
sage -t --long --random-seed=0 src/sage/arith/misc.py
**********************************************************************
File "src/sage/arith/misc.py", line 2019, in sage.arith.misc.xkcd
Failed example:
    xkcd(353)  # optional - internet
Expected:
    <h1>Python</h1><img src="https://imgs.xkcd.com/comics/python.png"; 
title="I wrote 20 short programs in Python yesterday.  It was wonderful.  
Perl, I'm leaving you."><div>Source: <a href="http://xkcd.com/353"; 
target="_blank">http://xkcd.com/353</a></div>
Got:
    <script> alert("Error: -41"); </script>
**********************************************************************
1 item had failures:
   1 of   2 in sage.arith.misc.xkcd
    1 kash test not run
    2 magma tests not run
    1 not tested test not run
    0 tests not run because we ran out of time
    [1066 tests, 1 failure, 22.54 s]
sage -t --long --random-seed=0 src/sage/symbolic/integration/external.py
**********************************************************************
File "src/sage/symbolic/integration/external.py", line 260, in 
sage.symbolic.integration.external.parse_moutput_from_json
Failed example:
    sorted(L)                                             # optional 
internet
Expected:
    [u'-Cos[x]', u'{{x == Pi C[1], Element[C[1], Integers]}}']
Got:
    ['-Cos[x]', '{{x == 0}}', '{{x == Pi C[1], Element[C[1], Integers]}}']
**********************************************************************
1 item had failures:
   1 of  10 in sage.symbolic.integration.external.parse_moutput_from_json
    0 tests not run because we ran out of time
    [48 tests, 1 failure, 24.69 s]
sage -t --long --random-seed=0 src/sage/lfunctions/sympow.py
**********************************************************************
File "src/sage/lfunctions/sympow.py", line 277, in 
sage.lfunctions.sympow.Sympow.analytic_rank
Failed example:
    sympow.analytic_rank(EllipticCurve('11a'))
Exception raised:
    Traceback (most recent call last):
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 720, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 1145, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.lfunctions.sympow.Sympow.analytic_rank[0]>", line 
1, in <module>
        sympow.analytic_rank(EllipticCurve('11a'))
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/lfunctions/sympow.py",
 
line 299, in analytic_rank
        raise RuntimeError("failed to compute analytic rank")
    RuntimeError: failed to compute analytic rank
**********************************************************************
File "src/sage/lfunctions/sympow.py", line 281, in 
sage.lfunctions.sympow.Sympow.analytic_rank
Failed example:
    sympow.analytic_rank(EllipticCurve('389a'))
Exception raised:
    Traceback (most recent call last):
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 720, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 1145, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.lfunctions.sympow.Sympow.analytic_rank[2]>", line 
1, in <module>
        sympow.analytic_rank(EllipticCurve('389a'))
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/lfunctions/sympow.py",
 
line 299, in analytic_rank
        raise RuntimeError("failed to compute analytic rank")
    RuntimeError: failed to compute analytic rank
**********************************************************************
File "src/sage/lfunctions/sympow.py", line 285, in 
sage.lfunctions.sympow.Sympow.analytic_rank
Failed example:
    sympow.analytic_rank(EllipticCurve([1, -1, 0, -79, 289]))
Exception raised:
    Traceback (most recent call last):
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 720, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 1145, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.lfunctions.sympow.Sympow.analytic_rank[4]>", line 
1, in <module>
        sympow.analytic_rank(EllipticCurve([Integer(1), -Integer(1), 
Integer(0), -Integer(79), Integer(289)]))
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/lfunctions/sympow.py",
 
line 299, in analytic_rank
        raise RuntimeError("failed to compute analytic rank")
    RuntimeError: failed to compute analytic rank
**********************************************************************
File "src/sage/lfunctions/sympow.py", line 289, in 
sage.lfunctions.sympow.Sympow.analytic_rank
Failed example:
    sympow.analytic_rank(EllipticCurve([1, 1, 0, -2582, 48720]))  # long 
time
Exception raised:
    Traceback (most recent call last):
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 720, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 1145, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.lfunctions.sympow.Sympow.analytic_rank[6]>", line 
1, in <module>
        sympow.analytic_rank(EllipticCurve([Integer(1), Integer(1), 
Integer(0), -Integer(2582), Integer(48720)]))  # long time
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/lfunctions/sympow.py",
 
line 299, in analytic_rank
        raise RuntimeError("failed to compute analytic rank")
    RuntimeError: failed to compute analytic rank
**********************************************************************
1 item had failures:
   4 of   9 in sage.lfunctions.sympow.Sympow.analytic_rank
    5 not tested tests not run
    0 tests not run because we ran out of time
    [13 tests, 4 failures, 3.39 s]
sage -t --long --random-seed=0 src/sage/symbolic/integration/integral.py
**********************************************************************
File "src/sage/symbolic/integration/integral.py", line 72, in 
sage.symbolic.integration.integral.IndefiniteIntegral.__init__
Failed example:
    (f*f).integrate(x, algorithm="mathematica_free") # optional -- internet
Expected:
    -b*log(e^(-(a - x)/b) + 1) + x + b/(e^(-(a - x)/b) + 1)
Got:
    -b*log(e^(a/b) + e^(x/b)) + x + b/(e^(-(a - x)/b) + 1)
**********************************************************************
1 item had failures:
   1 of  12 in 
sage.symbolic.integration.integral.IndefiniteIntegral.__init__
    3 tests not run due to known bugs
    2 maple tests not run
    3 mathematica tests not run
    0 tests not run because we ran out of time
    [216 tests, 1 failure, 26.14 s]
sage -t --long --random-seed=0 src/sage/misc/remote_file.py
**********************************************************************
File "src/sage/misc/remote_file.py", line 27, in 
sage.misc.remote_file.get_remote_file
Failed example:
    with open(g) as f: print(f.read())           # optional - internet
Expected:
    print("hi from the net")
    <BLANKLINE>
    print(2+3)
Got:
    print("hi from the net")
    <BLANKLINE>
    print(2 + 3)
    <BLANKLINE>
**********************************************************************
1 item had failures:
   1 of   4 in sage.misc.remote_file.get_remote_file
    0 tests not run because we ran out of time
    [3 tests, 1 failure, 0.26 s]
sage -t --long --random-seed=0 src/doc/en/constructions/interface_issues.rst
**********************************************************************
File "src/doc/en/constructions/interface_issues.rst", line 432, in 
doc.en.constructions.interface_issues
Failed example:
    octave("atanh(1.1)")   ## optional - octave
Expected:
    (1.52226,-1.5708)
Got:
     (1.52226,1.5708)
**********************************************************************
1 item had failures:
   1 of  22 in doc.en.constructions.interface_issues
    0 tests not run because we ran out of time
    [17 tests, 1 failure, 1.98 s]
sage -t --long --random-seed=0 src/sage/graphs/graph.py
**********************************************************************
File "src/sage/graphs/graph.py", line 4507, in 
sage.graphs.graph.Graph.has_homomorphism_to
Failed example:
    g.has_homomorphism_to(graphs.CycleGraph(4)) is not False
Expected:
    False
Got:
    True
**********************************************************************
File "src/sage/graphs/graph.py", line 4902, in sage.graphs.graph.Graph.minor
Failed example:
    L = g.minor(graphs.CompleteGraph(3))
Expected:
    Traceback (most recent call last):
    ...
    ValueError: This graph has no minor isomorphic to H !
Got:
    <BLANKLINE>
**********************************************************************
File "src/sage/graphs/graph.py", line 6112, in 
sage.graphs.graph.Graph.topological_minor
Failed example:
    g.topological_minor(graphs.CycleGraph(3))
Expected:
    False
Got:
    Subgraph of (Subgraph of (RandomGNP(15,0.300000000000000))): Graph on 0 
vertices
**********************************************************************
3 items had failures:
   1 of  10 in sage.graphs.graph.Graph.has_homomorphism_to
   1 of  14 in sage.graphs.graph.Graph.minor
   1 of   7 in sage.graphs.graph.Graph.topological_minor
    2 mcqd tests not run
    2 not tested tests not run
    13 python_igraph tests not run
    0 tests not run because we ran out of time
    [1238 tests, 3 failures, 26.85 s]
sage -t --long --random-seed=0 
src/sage/combinat/designs/incidence_structures.py
**********************************************************************
File "src/sage/combinat/designs/incidence_structures.py", line 2027, in 
sage.combinat.designs.incidence_structures.IncidenceStructure.coloring
Failed example:
    len(designs.steiner_triple_system(7).coloring())
Expected:
    3
Got:
    2
**********************************************************************
1 item had failures:
   1 of   6 in 
sage.combinat.designs.incidence_structures.IncidenceStructure.coloring
    8 gap_packages tests not run
    3 not tested tests not run
    0 tests not run because we ran out of time
    [337 tests, 1 failure, 1.58 s]
sage -t --long --random-seed=0 src/sage/databases/oeis.py
**********************************************************************
File "src/sage/databases/oeis.py", line 527, in 
sage.databases.oeis.OEIS.find_by_subsequence
Failed example:
    oeis.find_by_subsequence([2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 
377]) # optional -- internet
Expected:
    0: A000045: Fibonacci numbers: F(n) = F(n-1) + F(n-2) with F(0) = 0 and 
F(1) = 1.
    1: A212804: Expansion of (1-x)/(1-x-x^2).
    2: A177194: Fibonacci numbers whose decimal expansion does not contain 
any digit 0.
Got:
    0: A000045: Fibonacci numbers: F(n) = F(n-1) + F(n-2) with F(0) = 0 and 
F(1) = 1.
    1: A212804: Expansion of (1 - x)/(1 - x - x^2).
    2: A177194: Fibonacci numbers whose decimal expansion does not contain 
any digit 0.
**********************************************************************
1 item had failures:
   1 of   3 in sage.databases.oeis.OEIS.find_by_subsequence
    5 webbrowser tests not run
    0 tests not run because we ran out of time
    [287 tests, 1 failure, 32.50 s]
sage -t --long --random-seed=0 src/sage/graphs/generic_graph.py
**********************************************************************
File "src/sage/graphs/generic_graph.py", line 8909, in 
sage.graphs.generic_graph.GenericGraph.nowhere_zero_flow
Failed example:
    h = g.nowhere_zero_flow(k=3)
Expected:
    Traceback (most recent call last):
    ...
    EmptySetError: the problem has no feasible solution
Got:
    <BLANKLINE>
**********************************************************************
File "src/sage/graphs/generic_graph.py", line 9530, in 
sage.graphs.generic_graph.GenericGraph.disjoint_routed_paths
Failed example:
    p1,p2 = g.disjoint_routed_paths([((0, 0), (4, 4)), ((0, 4), (4, 0))])
Expected:
    Traceback (most recent call last):
    ...
    EmptySetError: the disjoint routed paths do not exist
Got:
    <BLANKLINE>
**********************************************************************
2 items had failures:
   1 of   5 in sage.graphs.generic_graph.GenericGraph.disjoint_routed_paths
   1 of  29 in sage.graphs.generic_graph.GenericGraph.nowhere_zero_flow
    17 bliss tests not run
    6 not tested tests not run
    39 python_igraph tests not run
    0 tests not run because we ran out of time
    [3513 tests, 2 failures, 36.86 s]
sage -t --long --random-seed=0 src/sage/misc/package.py
**********************************************************************
File "src/sage/misc/package.py", line 103, in 
sage.misc.package.pip_remote_version
Failed example:
    pip_remote_version(nap, pypi_url=pypi, ignore_URLError=True) # optional 
- internet
Expected:
    doctest:...: UserWarning: failed to fetch the version of
    pkg='hey_this_is_NOT_a_python_package' at http://this.is.not.pypi.com/
Got:
    doctest:warning
      File "/home/slabbe/GitBox/sage/src/bin/sage-runtests", line 182, in 
<module>
        err = DC.run()
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/control.py",
 
line 1230, in run
        self.run_doctests()
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/control.py",
 
line 931, in run_doctests
        self.dispatcher.dispatch()
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 2052, in dispatch
        self.parallel_dispatch()
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 1947, in parallel_dispatch
        w.start()  # This might take some time
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 2219, in start
        super(DocTestWorker, self).start()
      File "/usr/lib/python3.8/multiprocessing/process.py", line 121, in 
start
        self._popen = self._Popen(self)
      File "/usr/lib/python3.8/multiprocessing/context.py", line 224, in 
_Popen
        return _default_context.get_context().Process._Popen(process_obj)
      File "/usr/lib/python3.8/multiprocessing/context.py", line 276, in 
_Popen
        return Popen(process_obj)
      File "/usr/lib/python3.8/multiprocessing/popen_fork.py", line 19, in 
__init__
        self._launch(process_obj)
      File "/usr/lib/python3.8/multiprocessing/popen_fork.py", line 75, in 
_launch
        code = process_obj._bootstrap(parent_sentinel=child_r)
      File "/usr/lib/python3.8/multiprocessing/process.py", line 313, in 
_bootstrap
        self.run()
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 2191, in run
        task(self.options, self.outtmpfile, msgpipe, self.result_queue)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 2520, in __call__
        doctests, extras = self._run(runner, options, results)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 2567, in _run
        result = runner.run(test)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 918, in run
        return self._run(test, compileflags, out)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 720, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/doctest/forker.py",
 
line 1145, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.misc.package.pip_remote_version[3]>", line 1, in 
<module>
        pip_remote_version(nap, pypi_url=pypi, ignore_URLError=True) # 
optional - internet
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.8/site-packages/sage/misc/package.py",
 
line 120, in pip_remote_version
        warnings.warn("failed to fetch the version of pkg={!r} at 
{}".format(pkg, url))
      File "/usr/lib/python3.8/warnings.py", line 109, in _showwarnmsg
        sw(msg.message, msg.category, msg.filename, msg.lineno,
    :
    UserWarning: failed to fetch the version of 
pkg='hey_this_is_NOT_a_python_package' at 
http://this.is.not.pypi.com//hey_this_is_NOT_a_python_package/json
**********************************************************************

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