OS: Xubuntu 18.04.1 64-bit
downloaded from SAGE: sage-8.9-Ubuntu_16.04-x86_64.tar.bz2
decompressed with tar -xjf sage-8.9...

I did a cd to the uncompressed folder, SageMath, and issued the command:
./sage

It then went thru a long sequence of patches, put up the following msg box:
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 8.9, Release Date: 2019-09-29
                                                                  │
│ Using Python 2.7.15. Type "help()" for help.
                                                                          │
└────────────────────────────────────────────────────────────────────┘
and then issued the Oops message.

As I recall I went through the very same sequence with SAGE 8.8 & it's
worked just fine...Dave

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***************************************************************************

IPython post-mortem report

{'commit_hash': u'033ab93c7',
 'commit_source': 'installation',
 'default_encoding': 'UTF-8',
 'ipython_path': 
'/home/dave/sage-8.9/local/lib/python2.7/site-packages/IPython',
 'ipython_version': '5.8.0',
 'os_name': 'posix',
 'platform': 'Linux-5.0.0-31-generic-x86_64-with-debian-buster-sid',
 'sys_executable': '/home/dave/sage-8.9/local/bin/python2',
 'sys_platform': 'linux2',
 'sys_version': '2.7.15 (default, Oct  4 2019, 05:22:55) \n[GCC 7.4.0]'}

***************************************************************************



***************************************************************************

Crash traceback:

---------------------------------------------------------------------------
---------------------------------------------------------------------------
ImportError            Python 2.7.15: /home/dave/sage-8.9/local/bin/python2
                                                   Sun Oct 13 16:50:08 2019
A problem occurred executing Python code.  Here is the sequence of function
calls leading up to the error, with the most recent (innermost) call last.
/home/dave/sage-8.9/src/bin/sage-ipython in <module>()
      1 #!/usr/bin/env sage-python23
      2 # -*- coding: utf-8 -*-
      3 """
      4 Sage IPython startup script.
      5 """
      6 
      7 # Display startup banner. Do this before anything else to give the user
      8 # early feedback that Sage is starting.
      9 from sage.misc.banner import banner
     10 banner()
     11 
     12 from sage.repl.interpreter import SageTerminalApp
     13 
     14 app = SageTerminalApp.instance()
---> 15 app.initialize()
        global app.initialize = <bound method SageTerminalApp.initialize of 
<sage.repl.interpreter.SageTerminalApp object at 0x7f25ceebc090>>
     16 app.start()

</home/dave/sage-8.9/local/lib/python2.7/site-packages/decorator.py:decorator-gen-110>
 in initialize(self=<sage.repl.interpreter.SageTerminalApp object>, argv=None)

/home/dave/sage-8.9/local/lib/python2.7/site-packages/traitlets/config/application.py
 in catch_config_error(method=<function initialize>, 
app=<sage.repl.interpreter.SageTerminalApp object>, *args=(None,), **kwargs={})
     72     TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR = False
     73 else:
     74     raise ValueError("Unsupported value for environment variable: 
'TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR' is set to '%s' which is none of 
 {'0', '1', 'false', 'true', ''}."% _envvar )
     75 
     76 
     77 @decorator
     78 def catch_config_error(method, app, *args, **kwargs):
     79     """Method decorator for catching invalid config 
(Trait/ArgumentErrors) during init.
     80 
     81     On a TraitError (generally caused by bad config), this will print 
the trait's
     82     message, and exit the app.
     83 
     84     For use on init methods, to prevent invoking excepthook on invalid 
input.
     85     """
     86     try:
---> 87         return method(app, *args, **kwargs)
        method = <function initialize at 0x7f25c98218c0>
        app = <sage.repl.interpreter.SageTerminalApp object at 0x7f25ceebc090>
        args = (None,)
        kwargs = {}
     88     except (TraitError, ArgumentError) as e:
     89         app.print_help()
     90         app.log.fatal("Bad config encountered during initialization:")
     91         app.log.fatal(str(e))
     92         app.log.debug("Config at the time: %s", app.config)
     93         app.exit(1)
     94 
     95 
     96 class ApplicationError(Exception):
     97     pass
     98 
     99 
    100 class LevelFormatter(logging.Formatter):
    101     """Formatter with additional `highlevel` record
    102 

/home/dave/sage-8.9/local/lib/python2.7/site-packages/IPython/terminal/ipapp.py 
in initialize(self=<sage.repl.interpreter.SageTerminalApp object>, argv=None)
    301 
    302         return super(TerminalIPythonApp, self).parse_command_line(argv)
    303     
    304     @catch_config_error
    305     def initialize(self, argv=None):
    306         """Do actions after construct, but before starting the app."""
    307         super(TerminalIPythonApp, self).initialize(argv)
    308         if self.subapp is not None:
    309             # don't bother initializing further, starting subapp
    310             return
    311         # print self.extra_args
    312         if self.extra_args and not self.something_to_run:
    313             self.file_to_run = self.extra_args[0]
    314         self.init_path()
    315         # create the shell
--> 316         self.init_shell()
        self.init_shell = <bound method SageTerminalApp.init_shell of 
<sage.repl.interpreter.SageTerminalApp object at 0x7f25ceebc090>>
    317         # and draw the banner
    318         self.init_banner()
    319         # Now a variety of things that happen after the banner is 
printed.
    320         self.init_gui_pylab()
    321         self.init_extensions()
    322         self.init_code()
    323 
    324     def init_shell(self):
    325         """initialize the InteractiveShell instance"""
    326         # Create an InteractiveShell instance.
    327         # shell.display_banner should always be False for the terminal
    328         # based app, because we call shell.show_banner() by hand below
    329         # so the banner shows *before* all extension loading stuff.
    330         self.shell = self.interactive_shell_class.instance(parent=self,
    331                         profile_dir=self.profile_dir,

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/repl/interpreter.py 
in init_shell(self=<sage.repl.interpreter.SageTerminalApp object>)
    772         self.shell.has_sage_extensions = SAGE_EXTENSION in 
self.extensions
    773 
    774         # Load the %lprun extension if available
    775         try:
    776             import line_profiler
    777         except ImportError:
    778             pass
    779         else:
    780             self.extensions.append('line_profiler')
    781 
    782         if self.shell.has_sage_extensions:
    783             self.extensions.remove(SAGE_EXTENSION)
    784 
    785             # load sage extension here to get a crash if
    786             # something is wrong with the sage library
--> 787             self.shell.extension_manager.load_extension(SAGE_EXTENSION)
        self.shell.extension_manager.load_extension = <bound method 
ExtensionManager.load_extension of <IPython.core.extensions.ExtensionManager 
object at 0x7f25c975f410>>
        global SAGE_EXTENSION = 'sage'
    788 
    789 

/home/dave/sage-8.9/local/lib/python2.7/site-packages/IPython/core/extensions.py
 in load_extension(self=<IPython.core.extensions.ExtensionManager object>, 
module_str='sage')
     70 
     71         Returns the string "already loaded" if the extension is already 
loaded,
     72         "no load function" if the module doesn't have a 
load_ipython_extension
     73         function, or None if it succeeded.
     74         """
     75         if module_str in self.loaded:
     76             return "already loaded"
     77         
     78         from IPython.utils.syspathcontext import prepended_to_syspath
     79         
     80         with self.shell.builtin_trap:
     81             if module_str not in sys.modules:
     82                 with prepended_to_syspath(self.ipython_extension_dir):
     83                     __import__(module_str)
     84             mod = sys.modules[module_str]
---> 85             if self._call_load_ipython_extension(mod):
        self._call_load_ipython_extension = <bound method 
ExtensionManager._call_load_ipython_extension of 
<IPython.core.extensions.ExtensionManager object at 0x7f25c975f410>>
        mod = <module 'sage' from 
'/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/__init__.py'>
     86                 self.loaded.add(module_str)
     87             else:
     88                 return "no load function"
     89 
     90     def unload_extension(self, module_str):
     91         """Unload an IPython extension by its module name.
     92 
     93         This function looks up the extension's name in ``sys.modules`` 
and
     94         simply calls ``mod.unload_ipython_extension(self)``.
     95         
     96         Returns the string "no unload function" if the extension 
doesn't define
     97         a function to unload itself, "not loaded" if the extension 
isn't loaded,
     98         otherwise None.
     99         """
    100         if module_str not in self.loaded:

/home/dave/sage-8.9/local/lib/python2.7/site-packages/IPython/core/extensions.py
 in _call_load_ipython_extension(self=<IPython.core.extensions.ExtensionManager 
object>, mod=<module 'sage' from 
'/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/__init__.py'>)
    117         """
    118         from IPython.utils.syspathcontext import prepended_to_syspath
    119 
    120         if (module_str in self.loaded) and (module_str in sys.modules):
    121             self.unload_extension(module_str)
    122             mod = sys.modules[module_str]
    123             with prepended_to_syspath(self.ipython_extension_dir):
    124                 reload(mod)
    125             if self._call_load_ipython_extension(mod):
    126                 self.loaded.add(module_str)
    127         else:
    128             self.load_extension(module_str)
    129 
    130     def _call_load_ipython_extension(self, mod):
    131         if hasattr(mod, 'load_ipython_extension'):
--> 132             mod.load_ipython_extension(self.shell)
        mod.load_ipython_extension = <function load_ipython_extension at 
0x7f25d12037d0>
        self.shell = <sage.repl.interpreter.SageTerminalInteractiveShell object 
at 0x7f25c9823e50>
    133             return True
    134 
    135     def _call_unload_ipython_extension(self, mod):
    136         if hasattr(mod, 'unload_ipython_extension'):
    137             mod.unload_ipython_extension(self.shell)
    138             return True
    139 
    140     def install_extension(self, url, filename=None):
    141         """Download and install an IPython extension. 
    142 
    143         If filename is given, the file will be so named (inside the 
extension
    144         directory). Otherwise, the name from the URL will be used. The 
file must
    145         have a .py or .zip extension; otherwise, a ValueError will be 
raised.
    146 
    147         Returns the full path to the installed file.

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/__init__.py in 
load_ipython_extension(*args=(<sage.repl.interpreter.SageTerminalInteractiveShell
 object>,))
      1 __all__ = ['all']
      2 
      3 # Set sage.__version__ to the current version number. This is analogous
      4 # to many other Python packages.
      5 from sage.version import version as __version__
      6 
      7 # Make sure that the correct zlib library is loaded. This is needed
      8 # to prevent the system zlib to be loaded instead of the Sage one.
      9 # See https://trac.sagemath.org/ticket/23122
     10 import zlib
     11 
     12 # IPython calls this when starting up
     13 def load_ipython_extension(*args):
     14     import sage.repl.ipython_extension
---> 15     sage.repl.ipython_extension.load_ipython_extension(*args)
        sage.repl.ipython_extension.load_ipython_extension = <function 
load_ipython_extension at 0x7f25c0047410>
        args = (<sage.repl.interpreter.SageTerminalInteractiveShell object at 
0x7f25c9823e50>,)
     16 
     17 
     18 # Monkey-patch inspect.isfunction() to support Cython functions.
     19 def isfunction(obj):
     20     """
     21     Check whether something is a function.
     22 
     23     We assume that anything which has a genuine ``__code__``
     24     attribute (not using ``__getattr__`` overrides) is a function.
     25     This is meant to support Cython functions.
     26 
     27     EXAMPLES::
     28 
     29         sage: from inspect import isfunction
     30         sage: def f(): pass
     31         sage: isfunction(f)

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/repl/ipython_extension.py
 in wrapper(*args=(<sage.repl.interpreter.SageTerminalInteractiveShell 
object>,), **kwargs={})
    547         ....:     if work:
    548         ....:         return 'foo worked'
    549         ....:     raise RuntimeError("foo didn't work")
    550         sage: foo(False)
    551         Traceback (most recent call last):
    552         ...
    553         RuntimeError: foo didn't work
    554         sage: foo(True)
    555         'foo worked'
    556         sage: foo(False)
    557         sage: foo(True)
    558     """
    559     @wraps(func)
    560     def wrapper(*args, **kwargs):
    561         if not wrapper.has_run:
--> 562             result = func(*args, **kwargs)
        result = undefined
        global func = undefined
        args = (<sage.repl.interpreter.SageTerminalInteractiveShell object at 
0x7f25c9823e50>,)
        kwargs = {}
    563             wrapper.has_run = True
    564             return result
    565     wrapper.has_run = False
    566     return wrapper
    567 
    568 
    569 @run_once
    570 def load_ipython_extension(ip):
    571     """
    572     Load the extension in IPython.
    573     """
    574     # this modifies ip
    575     SageCustomizations(shell=ip)

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/repl/ipython_extension.py
 in 
load_ipython_extension(ip=<sage.repl.interpreter.SageTerminalInteractiveShell 
object>)
    560     def wrapper(*args, **kwargs):
    561         if not wrapper.has_run:
    562             result = func(*args, **kwargs)
    563             wrapper.has_run = True
    564             return result
    565     wrapper.has_run = False
    566     return wrapper
    567 
    568 
    569 @run_once
    570 def load_ipython_extension(ip):
    571     """
    572     Load the extension in IPython.
    573     """
    574     # this modifies ip
--> 575     SageCustomizations(shell=ip)
        global SageCustomizations = <class 
'sage.repl.ipython_extension.SageCustomizations'>
        global shell = undefined
        ip = <sage.repl.interpreter.SageTerminalInteractiveShell object at 
0x7f25c9823e50>

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/repl/ipython_extension.py
 in __init__(self=<sage.repl.ipython_extension.SageCustomizations object>, 
shell=<sage.repl.interpreter.SageTerminalInteractiveShell object>)
    418     def __init__(self, shell=None):
    419         """
    420         Initialize the Sage plugin.
    421         """
    422         self.shell = shell
    423 
    424         self.auto_magics = SageMagics(shell)
    425         self.shell.register_magics(self.auto_magics)
    426 
    427         import sage.misc.edit_module as edit_module
    428         self.shell.set_hook('editor', edit_module.edit_devel)
    429 
    430         self.init_inspector()
    431         self.init_line_transforms()
    432 
--> 433         import sage.all # until sage's import hell is fixed
        sage.all = undefined
    434 
    435         self.shell.verbose_quit = True
    436         self.set_quit_hook()
    437 
    438         self.register_interface_magics()
    439 
    440         if SAGE_IMPORTALL == 'yes':
    441             self.init_environment()
    442 
    443     def register_interface_magics(self):
    444         """
    445         Register magics for each of the Sage interfaces
    446         """
    447         from sage.repl.interface_magic import InterfaceMagic
    448         InterfaceMagic.register_all(self.shell)

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/all.py in <module>()
     82 
     83 import sage.misc.lazy_import
     84 from sage.misc.all       import *         # takes a while
     85 from sage.typeset.all    import *
     86 from sage.repl.all       import *
     87 
     88 from sage.misc.sh import sh
     89 
     90 from sage.libs.all       import *
     91 from sage.data_structures.all import *
     92 from sage.doctest.all    import *
     93 
     94 from sage.structure.all  import *
     95 from sage.rings.all      import *
     96 from sage.arith.all      import *
---> 97 from sage.matrix.all     import *
        global sage.matrix.all = undefined
     98 
     99 from sage.symbolic.all   import *
    100 from sage.modules.all    import *
    101 from sage.monoids.all    import *
    102 from sage.algebras.all   import *
    103 from sage.modular.all    import *
    104 from sage.sat.all        import *
    105 from sage.schemes.all    import *
    106 from sage.graphs.all     import *
    107 from sage.groups.all     import *
    108 from sage.arith.power    import generic_power as power
    109 from sage.databases.all  import *
    110 from sage.categories.all import *
    111 from sage.sets.all       import *
    112 from sage.probability.all import *

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/matrix/__init__.py 
in <module>()
      1 # Resolve a cyclic import
----> 2 import sage.matrix.args
        global sage.matrix.args = undefined

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/matrix/args.pyx in 
init sage.matrix.args (build/cythonized/sage/matrix/args.c:21226)()
     10 # This program is free software: you can redistribute it and/or modify
     11 # it under the terms of the GNU General Public License as published by
     12 # the Free Software Foundation, either version 2 of the License, or
     13 # (at your option) any later version.
     14 #                  http://www.gnu.org/licenses/
     15 
#*****************************************************************************
     16 
     17 from __future__ import absolute_import, generator_stop
     18 
     19 cimport cython
     20 from cpython.sequence cimport PySequence_Fast
     21 from cysignals.signals cimport sig_check
     22 from cypari2.gen cimport Gen
     23 from cypari2.types cimport typ, t_MAT, t_VEC, t_COL, t_VECSMALL, 
t_LIST, t_STR, t_CLOSURE
     24 
---> 25 from .matrix_space import MatrixSpace
        global matrix_space = undefined
        global MatrixSpace = undefined
     26 from sage.rings.all import ZZ, RDF, CDF
     27 from sage.structure.coerce cimport (coercion_model,
     28         is_numpy_type, py_scalar_parent)
     29 from sage.structure.element cimport Element, RingElement, Vector
     30 from sage.arith.long cimport pyobject_to_long
     31 from sage.misc.misc_c import sized_iter
     32 from sage.categories import monoids
     33 
     34 
     35 CommutativeMonoids = monoids.Monoids().Commutative()
     36 
     37 
     38 cdef inline bint element_is_scalar(Element x):
     39     """
     40     Should this element be considered a scalar (as opposed to a vector)?

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/matrix/matrix_space.py
 in <module>()
     31 # (at your option) any later version.
     32 #                  https://www.gnu.org/licenses/
     33 # 
****************************************************************************
     34 from __future__ import print_function, absolute_import
     35 from six.moves import range
     36 from six import iteritems, integer_types
     37 
     38 # System imports
     39 import sys
     40 import operator
     41 
     42 # Sage matrix imports
     43 from . import matrix_generic_dense
     44 from . import matrix_generic_sparse
     45 
---> 46 from . import matrix_modn_sparse
        global matrix_modn_sparse = undefined
     47 
     48 from . import matrix_mod2_dense
     49 from . import matrix_gf2e_dense
     50 
     51 from . import matrix_integer_dense
     52 from . import matrix_integer_sparse
     53 
     54 from . import matrix_rational_dense
     55 from . import matrix_rational_sparse
     56 
     57 from . import matrix_polynomial_dense
     58 from . import matrix_mpolynomial_dense
     59 
     60 # Sage imports
     61 from sage.misc.superseded import deprecation

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/matrix/matrix_integer_sparse.pxd
 in init sage.matrix.matrix_modn_sparse 
(build/cythonized/sage/matrix/matrix_modn_sparse.cpp:16317)()
      1 from sage.modules.vector_integer_sparse cimport mpz_vector
      2 from sage.ext.mod_int cimport mod_int
      3 from .matrix_sparse cimport Matrix_sparse
      4 
----> 5 cdef class Matrix_integer_sparse(Matrix_sparse):
        global cdef = undefined
        global Matrix_integer_sparse = undefined
        global Matrix_sparse = undefined
      6     cdef mpz_vector* _matrix
      7 
      8     cdef _mod_int_c(self, mod_int p)

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/matrix/matrix_integer_dense.pxd
 in init sage.matrix.matrix_integer_sparse 
(build/cythonized/sage/matrix/matrix_integer_sparse.cpp:15958)()
      1 from sage.libs.gmp.types cimport *
      2 from sage.libs.flint.types cimport fmpz_mat_t
      3 
      4 from .matrix_dense cimport Matrix_dense
      5 from sage.rings.integer cimport Integer
      6 from sage.ext.mod_int cimport *
      7 
      8 ctypedef long* GEN
      9 
---> 10 cdef class Matrix_integer_dense(Matrix_dense):
        global cdef = undefined
        global Matrix_integer_dense = undefined
        global Matrix_dense = undefined
     11     cdef fmpz_mat_t _matrix
     12     cdef object _pivots
     13     cdef int mpz_height(self, mpz_t height) except -1
     14     cdef _mod_int_c(self, mod_int modulus)
     15     cdef _mod_two(self)
     16     cdef _pickle_version0(self)
     17     cdef _unpickle_version0(self, data)
     18     cpdef _export_as_string(self, int base=?)
     19     cdef void set_unsafe_mpz(self, Py_ssize_t i, Py_ssize_t j, const 
mpz_t value)
     20     cdef void set_unsafe_si(self, Py_ssize_t i, Py_ssize_t j, long 
value)
     21     cdef void set_unsafe_double(self, Py_ssize_t i, Py_ssize_t j, 
double value)
     22     cdef inline void get_unsafe_mpz(self, Py_ssize_t i, Py_ssize_t j, 
mpz_t value)
     23     cdef inline double get_unsafe_double(self, Py_ssize_t i, Py_ssize_t 
j)
     24 
     25     # HNF Modn
     26     cdef int _hnf_modn(Matrix_integer_dense self, Matrix_integer_dense 
res,
     27             unsigned int det) except -1
     28     cdef int* _hnf_modn_impl(Matrix_integer_dense self, unsigned int 
det,
     29             Py_ssize_t nrows, Py_ssize_t ncols) except NULL
     30 
     31     cdef Matrix_integer_dense _new(self, Py_ssize_t nrows, Py_ssize_t 
ncols)

/home/dave/sage-8.9/local/lib/python2.7/site-packages/sage/matrix/matrix_mod2_dense.pxd
 in init sage.matrix.matrix_integer_dense 
(build/cythonized/sage/matrix/matrix_integer_dense.c:55466)()
      1 from .matrix_dense cimport Matrix_dense
      2 from sage.libs.m4ri cimport *
      3 
----> 4 cdef class Matrix_mod2_dense(Matrix_dense):
        global cdef = undefined
        global Matrix_mod2_dense = undefined
        global Matrix_dense = undefined
      5     cdef mzd_t *_entries
      6     cdef object _one
      7     cdef object _zero
      8 
      9     cdef set_unsafe_int(self, Py_ssize_t i, Py_ssize_t j, int value)
     10 
     11     cpdef Matrix_mod2_dense _multiply_m4rm(Matrix_mod2_dense self, 
Matrix_mod2_dense right, int k)
     12     cpdef Matrix_mod2_dense _multiply_strassen(Matrix_mod2_dense self, 
Matrix_mod2_dense right, int cutoff)
     13 
     14     # For conversion to other systems
     15     cpdef _export_as_string(self)

ImportError: libpng12.so.0: cannot open shared object file: No such file or 
directory

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History of session input:
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