On Ubuntu 18.04, running tests with few optional and external packages, I 
get


Using 
--optional=4ti2,build,ccache,cryptominisat,debian,dot2tex,e_antic,external,fricas,glucose,latte_int,lidia,normaliz,notedown,pandoc_attributes,pip,pycosat,pynormaliz,rst2ipynb,sage,sage_numerical_backends_coin,sage_spkg
Features to be detected: 
4ti2,benzene,bliss,buckygen,conway_polynomials,cplex,csdp,database_cremona_ellcurve,database_cremona_mini_ellcurve,database_jones_numfield,database_knotinfo,dvipng,ffmpeg,graphviz,gurobi,imagemagick,internet,jupymake,kenzo,latex,latex_package_tkz_graph,latte_int,lrslib,lualatex,macaulay2,magma,maple,mathematica,matlab,mcqd,meataxe,octave,pandoc,pdf2svg,pdflatex,pdftocairo,plantri,pynormaliz,python_igraph,rubiks,sage.combinat,sage.geometry.polyhedron,sage.graphs,sage.groups,sage.plot,sage.rings.number_field,sage.rings.padics,sage.rings.real_double,sage.symbolic,sage_numerical_backends_coin,sagemath_doc_html,scilab,sphinx,tdlib,xelatex
[...]
----------------------------------------------------------------------
sage -t --long --random-seed=74925070263747290778454060298804908185 
src/sage/combinat/designs/incidence_structures.py  # 1 doctest failed
sage -t --long --random-seed=74925070263747290778454060298804908185 
src/sage/geometry/polyhedron/base.py  # 1 doctest failed
sage -t --long --random-seed=74925070263747290778454060298804908185 
src/sage/graphs/generic_graph.py  # 2 doctests failed
sage -t --long --random-seed=74925070263747290778454060298804908185 
src/sage/graphs/graph.py  # 2 doctests failed
sage -t --long --random-seed=74925070263747290778454060298804908185 
src/sage/numerical/backends/glpk_backend.pyx  # 4 doctests failed
sage -t --long --random-seed=74925070263747290778454060298804908185 
src/sage/numerical/backends/logging_backend.py  # Killed due to abort
sage -t --long --random-seed=74925070263747290778454060298804908185 
src/sage/numerical/mip.pyx  # 8 doctests failed
sage -t --long --random-seed=74925070263747290778454060298804908185 
src/sage/tests/books/computational-mathematics-with-sagemath/lp_doctest.py 
 # 2 doctests failed
sage -t --long --random-seed=74925070263747290778454060298804908185 
src/sage/tests/cmdline.py  # 1 doctest failed
----------------------------------------------------------------------
Features detected for doctesting: 
dvipng,ffmpeg,graphviz,imagemagick,internet,latex,latex_package_tkz_graph,lualatex,octave,pandoc,pdf2svg,pdflatex,pdftocairo,sage.combinat,sage.geometry.polyhedron,sage.graphs,sage.groups,sage.plot,sage.rings.number_field,sage.rings.padics,sage.rings.real_double,sage.symbolic,sagemath_doc_html,sphinx,xelatex


I can not reproduce the following:

src/sage/numerical/backends/logging_backend.py  # Killed due to abort




The issues with the following files are new to me:

src/sage/geometry/polyhedron/base.py  # 1 doctest failed
src/sage/numerical/backends/glpk_backend.pyx  # 4 doctests failed
src/sage/numerical/mip.pyx  # 8 doctests failed
src/sage/tests/books/computational-mathematics-with-sagemath/lp_doctest.py 
 # 2 doctests failed

These new failures are copied below.

Other failures are tracked at:
https://trac.sagemath.org/ticket/25536


sage -t --long --random-seed=318040679162492273521324225371525539537 
src/sage/tests/books/computational-mathematics-with-sagemath/lp_doctest.py
**********************************************************************
File 
"src/sage/tests/books/computational-mathematics-with-sagemath/lp_doctest.py", 
line 38, in 
sage.tests.books.computational-mathematics-with-sagemath.lp_doctest
Failed example:
    p.solve() # abs tol 1e-10
Expected:
    8.8
Got:
    Long-step dual simplex will be used
    8.8
**********************************************************************
File 
"src/sage/tests/books/computational-mathematics-with-sagemath/lp_doctest.py", 
line 127, in 
sage.tests.books.computational-mathematics-with-sagemath.lp_doctest
Failed example:
    p.solve() # abs tol 1e-10
Expected:
    1.4199999999999999
Got:
    Long-step dual simplex will be used
    1.42
**********************************************************************
1 item had failures:
   2 of  69 in 
sage.tests.books.computational-mathematics-with-sagemath.lp_doctest
    0 tests not run because we ran out of time
    [68 tests, 2 failures, 0.08 s]




sage -t --long --random-seed=318040679162492273521324225371525539537 
src/sage/numerical/backends/glpk_backend.pyx
**********************************************************************
File "src/sage/numerical/backends/glpk_backend.pyx", line 1104, in 
sage.numerical.backends.glpk_backend.GLPKBackend.solve
Failed example:
    p.solve() # rel tol 100
Expected:
    1
Got:
    Long-step dual simplex will be used
    2.0
**********************************************************************
File "src/sage/numerical/backends/glpk_backend.pyx", line 1111, in 
sage.numerical.backends.glpk_backend.GLPKBackend.solve
Failed example:
    p.solve() # rel tol 100
Expected:
    1
Got:
    Long-step dual simplex will be used
    7.0
**********************************************************************
File "src/sage/numerical/backends/glpk_backend.pyx", line 1204, in 
sage.numerical.backends.glpk_backend.GLPKBackend.best_known_objective_bound
Failed example:
    p.solve() # rel tol 100
Expected:
    1.0
Got:
    Long-step dual simplex will be used
    2.0
**********************************************************************
File "src/sage/numerical/backends/glpk_backend.pyx", line 1238, in 
sage.numerical.backends.glpk_backend.GLPKBackend.get_relative_objective_gap
Failed example:
    p.solve() # rel tol 100
Expected:
    1.0
Got:
    Long-step dual simplex will be used
    2.0
**********************************************************************
3 items had failures:
   1 of  11 in 
sage.numerical.backends.glpk_backend.GLPKBackend.best_known_objective_bound
   1 of  12 in 
sage.numerical.backends.glpk_backend.GLPKBackend.get_relative_objective_gap
   2 of  74 in sage.numerical.backends.glpk_backend.GLPKBackend.solve
    0 tests not run because we ran out of time
    [592 tests, 4 failures, 4.37 s]



sage -t --long --random-seed=318040679162492273521324225371525539537 
src/sage/numerical/mip.pyx
**********************************************************************
File "src/sage/numerical/mip.pyx", line 1921, in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.add_constraint
Failed example:
    p.solve()     # rel tol 1e-15
Expected:
    6.666666666666666
Got:
    Long-step dual simplex will be used
    6.666666666666666
**********************************************************************
File "src/sage/numerical/mip.pyx", line 1951, in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.add_constraint
Failed example:
    p.solve()     # rel tol 1e-15
Expected:
    6.666666666666666
Got:
    Long-step dual simplex will be used
    6.666666666666666
**********************************************************************
File "src/sage/numerical/mip.pyx", line 1963, in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.add_constraint
Failed example:
    p.solve()     # rel tol 1e-15
Expected:
    6.666666666666666
Got:
    Long-step dual simplex will be used
    6.666666666666666
**********************************************************************
File "src/sage/numerical/mip.pyx", line 1976, in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.add_constraint
Failed example:
    p.solve()     # rel tol 1e-15
Expected:
    6.666666666666666
Got:
    Long-step dual simplex will be used
    6.666666666666666
**********************************************************************
File "src/sage/numerical/mip.pyx", line 1989, in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.add_constraint
Failed example:
    p.solve()     # rel tol 1e-15
Expected:
    6.666666666666666
Got:
    Long-step dual simplex will be used
    6.666666666666666
**********************************************************************
File "src/sage/numerical/mip.pyx", line 2859, in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.get_objective_value
Failed example:
    p.solve()  # rel tol 1e-5
Expected:
    9.4
Got:
    Long-step dual simplex will be used
    9.399999999999999
**********************************************************************
File "src/sage/numerical/mip.pyx", line 2891, in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.best_known_objective_bound
Failed example:
    p.solve() # rel tol 100
Expected:
    1.0
Got:
    Long-step dual simplex will be used
    2.0
**********************************************************************
File "src/sage/numerical/mip.pyx", line 2925, in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.get_relative_objective_gap
Failed example:
    p.solve() # rel tol 100
Expected:
    1.0
Got:
    Long-step dual simplex will be used
    2.0
**********************************************************************
4 items had failures:
   5 of  54 in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.add_constraint
   1 of  10 in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.best_known_objective_bound
   1 of   8 in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.get_objective_value
   1 of  11 in 
sage.numerical.mip.MixedIntegerLinearProgram.number_of_variables.get_relative_objective_gap
    8 cplex tests not run
    3 gurobi tests not run
    7 not tested tests not run
    0 tests not run because we ran out of time
    [713 tests, 8 failures, 2.31 s]


sage -t --long --random-seed=318040679162492273521324225371525539537 
src/sage/geometry/polyhedron/base.py
**********************************************************************
File "src/sage/geometry/polyhedron/base.py", line 821, in 
sage.geometry.polyhedron.base.Polyhedron_base.to_linear_program
Failed example:
    lp.solve()                                               # tol 1e-8   # 
optional - sage.rings.number_field
Expected:
    1.3090169943749475
Got:
    Long-step dual simplex will be used
    1.3090169943749472
**********************************************************************
1 item had failures:
   1 of  32 in 
sage.geometry.polyhedron.base.Polyhedron_base.to_linear_program
    5 lrslib tests not run
    1 not tested test not run
    18 polymake tests not run
    0 tests not run because we ran out of time
    [544 tests, 1 failure, 44.05 s]

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