On Ubuntu 18.04 with many optional and external packages, I get

Using 
--optional=4ti2,argcomplete,build,ccache,cryptominisat,debian,dot2tex,e_antic,external,fricas,glucose,latte_int,lidia,normaliz,notedown,pandoc_attributes,pip,pycosat,pynormaliz,rst2ipynb,sage,sage.rings.real_double,sage_numerical_backends_coin,sage_spkg

----------------------------------------------------------------------
sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/combinat/designs/incidence_structures.py  # 1 doctest failed
sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/databases/findstat.py  # 9 doctests failed
sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/databases/oeis.py  # 5 doctests failed
sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/dynamics/arithmetic_dynamics/projective_ds.py  # 1 doctest failed
sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/finance/stock.py  # 1 doctest failed
sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/graphs/generic_graph.py  # 2 doctests failed
sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/graphs/graph.py  # 3 doctests failed
sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/sat/solvers/dimacs.py  # 2 doctests failed
sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/tests/cmdline.py  # 2 doctests failed
----------------------------------------------------------------------
External software detected for doctesting: 
ffmpeg,graphviz,imagemagick,internet,latex,octave,pandoc

Rerunning failed tests, I get:

----------------------------------------------------------------------
sage -t --long --random-seed=176741212041021026024743358104743777210 
src/sage/combinat/designs/incidence_structures.py  # 1 doctest failed
sage -t --long --random-seed=176741212041021026024743358104743777210 
src/sage/databases/findstat.py  # 9 doctests failed
sage -t --long --random-seed=176741212041021026024743358104743777210 
src/sage/databases/oeis.py  # 5 doctests failed
sage -t --long --random-seed=176741212041021026024743358104743777210 
src/sage/finance/stock.py  # 1 doctest failed
sage -t --long --random-seed=176741212041021026024743358104743777210 
src/sage/graphs/generic_graph.py  # 2 doctests failed
sage -t --long --random-seed=176741212041021026024743358104743777210 
src/sage/graphs/graph.py  # 2 doctests failed
sage -t --long --random-seed=176741212041021026024743358104743777210 
src/sage/sat/solvers/dimacs.py  # 2 doctests failed
sage -t --long --random-seed=176741212041021026024743358104743777210 
src/sage/tests/cmdline.py  # 2 doctests failed
----------------------------------------------------------------------
External software detected for doctesting: graphviz,internet,latex,pandoc


In particular, the failure with projective_ds.py does not reproduce, but is 
new so I copy it below. Also graph.py has 3 doctests failed and 2 doctests 
failed on the second run. So I copy both of them below. However, the three 
failing tests are not new.

A new failure is with dimacs.py related to the glucose SAT solver, which I 
copy below.

Other failures were already reported. Follow up at : 
https://trac.sagemath.org/ticket/25536


sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/dynamics/arithmetic_dynamics/projective_ds.py
**********************************************************************
File "src/sage/dynamics/arithmetic_dynamics/projective_ds.py", line 7076, 
in sage.dynamics.arithmetic_dynamics.projective_ds.?.conjugating_set
Failed example:
    D6.conjugating_set(D6)
Expected:
    [
    [1 0]  [0 1]  [0 2]  [4 0]  [2 0]  [0 4]
    [0 1], [1 0], [1 0], [0 1], [0 1], [1 0]
    ]
Got:
    [
    [4 0]  [2 0]  [0 4]  [1 0]  [0 1]  [0 2]
    [0 1], [0 1], [1 0], [0 1], [1 0], [1 0]
    ]
**********************************************************************
1 item had failures:
   1 of  60 in 
sage.dynamics.arithmetic_dynamics.projective_ds.?.conjugating_set
    0 tests not run because we ran out of time
    [1463 tests, 1 failure, 81.61 s]


sage -t --long --random-seed=169556229696715277486645962048997382006 
src/sage/graphs/graph.py
**********************************************************************
File "src/sage/graphs/graph.py", line 4287, in sage.graphs.graph.Graph.?
Failed example:
    g.has_homomorphism_to(graphs.CycleGraph(4)) is not False
Expected:
    False
Got:
    True
**********************************************************************
File "src/sage/graphs/graph.py", line 4694, 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 5909, in sage.graphs.graph.Graph.?
Failed example:
    g.topological_minor(graphs.CycleGraph(3))
Expected:
    False
Got:
    Subgraph of (Subgraph of (RandomGNP(15,0.300000000000000))): Graph on 0 
vertices
**********************************************************************
2 items had failures:
   2 of 279 in sage.graphs.graph.Graph.?
   1 of  14 in sage.graphs.graph.Graph.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
    [1216 tests, 3 failures, 44.15 s]



sage -t --long --random-seed=176741212041021026024743358104743777210 
src/sage/graphs/graph.py
**********************************************************************
File "src/sage/graphs/graph.py", line 4287, in sage.graphs.graph.Graph.?
Failed example:
    g.has_homomorphism_to(graphs.CycleGraph(4)) is not False
Expected:
    False
Got:
    True
**********************************************************************
File "src/sage/graphs/graph.py", line 4694, 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>
**********************************************************************
2 items had failures:
   1 of 279 in sage.graphs.graph.Graph.?
   1 of  14 in sage.graphs.graph.Graph.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
    [1216 tests, 2 failures, 38.67 s]




sage -t --long --random-seed=176741212041021026024743358104743777210 
src/sage/sat/solvers/dimacs.py
**********************************************************************
File "src/sage/sat/solvers/dimacs.py", line 520, in 
sage.sat.solvers.dimacs.Glucose.__call__
Failed example:
    solve_sat(F, solver=sage.sat.solvers.Glucose)  # optional - glucose
Expected:
    [{k003: 1,
      k002: 1,
      k001: 0,
      k000: 1,
      s003: 1,
      s002: 0,
      s001: 1,
      s000: 0,
      w103: 1,
      w102: 1,
      w101: 1,
      w100: 1,
      x103: 0,
      x102: 0,
      x101: 0,
      x100: 1,
      k103: 1,
      k102: 0,
      k101: 1,
      k100: 1}]
Got:
    [{k003: 0,
      k002: 1,
      k001: 1,
      k000: 0,
      s003: 1,
      s002: 1,
      s001: 1,
      s000: 0,
      w103: 1,
      w102: 1,
      w101: 1,
      w100: 0,
      x103: 0,
      x102: 1,
      x101: 1,
      x100: 0,
      k103: 0,
      k102: 1,
      k101: 1,
      k100: 0}]
**********************************************************************
File "src/sage/sat/solvers/dimacs.py", line 607, in 
sage.sat.solvers.dimacs.GlucoseSyrup.__call__
Failed example:
    solve_sat(F, solver=sage.sat.solvers.GlucoseSyrup)  # optional - glucose
Expected:
    [{k003: 1,
    k002: 1,
    k001: 0,
    k000: 1,
    s003: 1,
    s002: 0,
    s001: 1,
    s000: 0,
    w103: 1,
    w102: 1,
    w101: 1,
    w100: 1,
    x103: 0,
    x102: 0,
    x101: 0,
    x100: 1,
    k103: 1,
    k102: 0,
    k101: 1,
    k100: 1}]
Got:
    [{k003: 0,
      k002: 1,
      k001: 1,
      k000: 0,
      s003: 1,
      s002: 1,
      s001: 1,
      s000: 0,
      w103: 1,
      w102: 1,
      w101: 1,
      w100: 0,
      x103: 0,
      x102: 1,
      x101: 1,
      x100: 0,
      k103: 0,
      k102: 1,
      k101: 1,
      k100: 0}]
**********************************************************************
2 items had failures:
   1 of  13 in sage.sat.solvers.dimacs.Glucose.__call__
   1 of  13 in sage.sat.solvers.dimacs.GlucoseSyrup.__call__
    1 rsat test not run
    0 tests not run because we ran out of time
    [90 tests, 2 failures, 3.10 s]

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