​Greetings:

I originally had Anaconda3 installed on my Ubuntu 16.04 notebook and could
not get Sage to setup and run.

I then uninstalled Anaconda3 and then reinstalled Sage.​  After the
re-installation then Sage crashed.

Please help!

Thanks and regards,

Grant Ellis

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

IPython post-mortem report

{'commit_hash': u'5c9c918',
 'commit_source': 'installation',
 'default_encoding': 'UTF-8',
 'ipython_path': 
'/home/grant/SageMath/local/lib/python2.7/site-packages/IPython',
 'ipython_version': '5.1.0',
 'os_name': 'posix',
 'platform': 'Linux-4.8.0-54-generic-x86_64-with-debian-stretch-sid',
 'sys_executable': '/home/grant/SageMath/local/bin/python',
 'sys_platform': 'linux2',
 'sys_version': '2.7.13 (default, Mar 26 2017, 06:36:11) \n[GCC 5.4.0 
20160609]'}

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



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

Crash traceback:

---------------------------------------------------------------------------
---------------------------------------------------------------------------
ImportError            Python 2.7.13: /home/grant/SageMath/local/bin/python
                                                   Tue Jul 18 07:36:07 2017
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/grant/SageMath/src/bin/sage-ipython in <module>()
      1 #!/usr/bin/env python
      2 # -*- coding: utf-8 -*-
      3 """
      4 Sage IPython startup script.
      5 """
      6 
      7 from sage.repl.interpreter import SageTerminalApp
      8 
      9 app = SageTerminalApp.instance()
---> 10 app.initialize()
        global app.initialize = <bound method SageTerminalApp.initialize of 
<sage.repl.interpreter.SageTerminalApp object at 0x7f0a9447a350>>
     11 app.start()

<decorator-gen-109> in initialize(self=<sage.repl.interpreter.SageTerminalApp 
object>, argv=None)

/home/grant/SageMath/local/lib/python2.7/site-packages/traitlets/config/application.pyc
 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 0x7f0a8d273140>
        app = <sage.repl.interpreter.SageTerminalApp object at 0x7f0a9447a350>
        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/grant/SageMath/local/lib/python2.7/site-packages/IPython/terminal/ipapp.pyc
 in initialize(self=<sage.repl.interpreter.SageTerminalApp object>, argv=None)
    294 
    295         return super(TerminalIPythonApp, self).parse_command_line(argv)
    296     
    297     @catch_config_error
    298     def initialize(self, argv=None):
    299         """Do actions after construct, but before starting the app."""
    300         super(TerminalIPythonApp, self).initialize(argv)
    301         if self.subapp is not None:
    302             # don't bother initializing further, starting subapp
    303             return
    304         # print self.extra_args
    305         if self.extra_args and not self.something_to_run:
    306             self.file_to_run = self.extra_args[0]
    307         self.init_path()
    308         # create the shell
--> 309         self.init_shell()
        self.init_shell = <bound method SageTerminalApp.init_shell of 
<sage.repl.interpreter.SageTerminalApp object at 0x7f0a9447a350>>
    310         # and draw the banner
    311         self.init_banner()
    312         # Now a variety of things that happen after the banner is 
printed.
    313         self.init_gui_pylab()
    314         self.init_extensions()
    315         self.init_code()
    316 
    317     def init_shell(self):
    318         """initialize the InteractiveShell instance"""
    319         # Create an InteractiveShell instance.
    320         # shell.display_banner should always be False for the terminal
    321         # based app, because we call shell.show_banner() by hand below
    322         # so the banner shows *before* all extension loading stuff.
    323         self.shell = TerminalInteractiveShell.instance(parent=self,
    324                         profile_dir=self.profile_dir,

/home/grant/SageMath/local/lib/python2.7/site-packages/sage/repl/interpreter.pyc
 in init_shell(self=<sage.repl.interpreter.SageTerminalApp object>)
    747         self.shell.has_sage_extensions = SAGE_EXTENSION in 
self.extensions
    748 
    749         # Load the %lprun extension if available
    750         try:
    751             import line_profiler
    752         except ImportError:
    753             pass
    754         else:
    755             self.extensions.append('line_profiler')
    756 
    757         if self.shell.has_sage_extensions:
    758             self.extensions.remove(SAGE_EXTENSION)
    759 
    760             # load sage extension here to get a crash if
    761             # something is wrong with the sage library
--> 762             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 0x7f0a8c017d10>>
        global SAGE_EXTENSION = 'sage'
    763 
    764 

/home/grant/SageMath/local/lib/python2.7/site-packages/IPython/core/extensions.pyc
 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 0x7f0a8c017d10>>
        mod = <module 'sage' from 
'/home/grant/SageMath/local/lib/python2.7/site-packages/sage/__init__.pyc'>
     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/grant/SageMath/local/lib/python2.7/site-packages/IPython/core/extensions.pyc
 in _call_load_ipython_extension(self=<IPython.core.extensions.ExtensionManager 
object>, mod=<module 'sage' from 
'/home/grant/SageMath/local/lib/python2.7/site-packages/sage/__init__.pyc'>)
    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 
0x7f0a9446c758>
        self.shell = <sage.repl.interpreter.SageTerminalInteractiveShell object 
at 0x7f0a8d214150>
    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/grant/SageMath/local/lib/python2.7/site-packages/sage/__init__.pyc in 
load_ipython_extension(*args=(<sage.repl.interpreter.SageTerminalInteractiveShell
 object>,))
      1 __all__ = ['all']
      2 
      3 # IPython calls this when starting up
      4 def load_ipython_extension(*args):
      5     import sage.repl.ipython_extension
----> 6     sage.repl.ipython_extension.load_ipython_extension(*args)
        sage.repl.ipython_extension.load_ipython_extension = <function 
load_ipython_extension at 0x7f0a913accf8>
        args = (<sage.repl.interpreter.SageTerminalInteractiveShell object at 
0x7f0a8d214150>,)

/home/grant/SageMath/local/lib/python2.7/site-packages/sage/repl/ipython_extension.pyc
 in wrapper(*args=(<sage.repl.interpreter.SageTerminalInteractiveShell 
object>,), **kwargs={})
    490         ....:     if work:
    491         ....:         return 'foo worked'
    492         ....:     raise RuntimeError("foo didn't work")
    493         sage: foo(False)
    494         Traceback (most recent call last):
    495         ...
    496         RuntimeError: foo didn't work
    497         sage: foo(True)
    498         'foo worked'
    499         sage: foo(False)
    500         sage: foo(True)
    501     """
    502     @wraps(func)
    503     def wrapper(*args, **kwargs):
    504         if not wrapper.has_run:
--> 505             result = func(*args, **kwargs)
        result = undefined
        global func = undefined
        args = (<sage.repl.interpreter.SageTerminalInteractiveShell object at 
0x7f0a8d214150>,)
        kwargs = {}
    506             wrapper.has_run = True
    507             return result
    508     wrapper.has_run = False
    509     return wrapper
    510 
    511 
    512 @run_once
    513 def load_ipython_extension(ip):
    514     """
    515     Load the extension in IPython.
    516     """
    517     # this modifies ip
    518     SageCustomizations(shell=ip)

/home/grant/SageMath/local/lib/python2.7/site-packages/sage/repl/ipython_extension.pyc
 in 
load_ipython_extension(ip=<sage.repl.interpreter.SageTerminalInteractiveShell 
object>)
    503     def wrapper(*args, **kwargs):
    504         if not wrapper.has_run:
    505             result = func(*args, **kwargs)
    506             wrapper.has_run = True
    507             return result
    508     wrapper.has_run = False
    509     return wrapper
    510 
    511 
    512 @run_once
    513 def load_ipython_extension(ip):
    514     """
    515     Load the extension in IPython.
    516     """
    517     # this modifies ip
--> 518     SageCustomizations(shell=ip)
        global SageCustomizations = <class 
'sage.repl.ipython_extension.SageCustomizations'>
        global shell = undefined
        ip = <sage.repl.interpreter.SageTerminalInteractiveShell object at 
0x7f0a8d214150>

/home/grant/SageMath/local/lib/python2.7/site-packages/sage/repl/ipython_extension.pyc
 in __init__(self=<sage.repl.ipython_extension.SageCustomizations object>, 
shell=<sage.repl.interpreter.SageTerminalInteractiveShell object>)
    361     def __init__(self, shell=None):
    362         """
    363         Initialize the Sage plugin.
    364         """
    365         self.shell = shell
    366 
    367         self.auto_magics = SageMagics(shell)
    368         self.shell.register_magics(self.auto_magics)
    369 
    370         import sage.misc.edit_module as edit_module
    371         self.shell.set_hook('editor', edit_module.edit_devel)
    372 
    373         self.init_inspector()
    374         self.init_line_transforms()
    375 
--> 376         import sage.all # until sage's import hell is fixed
        sage.all = undefined
    377 
    378         self.shell.verbose_quit = True
    379         self.set_quit_hook()
    380 
    381         self.register_interface_magics()
    382 
    383         if SAGE_IMPORTALL == 'yes':
    384             self.init_environment()
    385 
    386     def register_interface_magics(self):
    387         """
    388         Register magics for each of the Sage interfaces
    389         """
    390         from sage.repl.interface_magic import InterfaceMagic
    391         InterfaceMagic.register_all(self.shell)

/home/grant/SageMath/local/lib/python2.7/site-packages/sage/all.py in <module>()
     77 
     78 # Add SAGE_SRC at the end of sys.path to enable Cython tracebacks
     79 # (which use paths relative to SAGE_SRC)
     80 sys.path.append(SAGE_SRC)
     81 
     82 
     83 ###################################################################
     84 
     85 # This import also setups the interrupt handler
     86 from cysignals.signals import (AlarmInterrupt, SignalError,
     87         sig_on_reset as sig_on_count)
     88 
     89 from time                import sleep
     90 
     91 import sage.misc.lazy_import
---> 92 from sage.misc.all       import *         # takes a while
        global sage.misc.all = undefined
     93 from sage.typeset.all    import *
     94 from sage.repl.all       import *
     95 
     96 from sage.misc.sh import sh
     97 
     98 from sage.libs.all       import *
     99 from sage.data_structures.all import *
    100 from sage.doctest.all    import *
    101 
    102 from sage.structure.all  import *
    103 from sage.rings.all      import *
    104 from sage.arith.all      import *
    105 from sage.matrix.all     import *
    106 
    107 from sage.symbolic.all   import *

/home/grant/SageMath/local/lib/python2.7/site-packages/sage/misc/all.py in 
<module>()
     73 
     74 from .defaults import (set_default_variable_name,
     75                         series_precision, set_series_precision)
     76 
     77 from .sage_eval import sage_eval, sageobj
     78 
     79 from .sage_input import sage_input
     80 
     81 lazy_import("sage.misc.cython", ["cython_lambda", 
"cython_create_local_so"]) 
     82 lazy_import("sage.misc.cython_c", "cython_compile", "cython")
     83 
     84 from .persist import save, load, dumps, loads, db, db_save
     85 
     86 from .func_persist import func_persist
     87 
---> 88 from .functional import (additive_order,
        global functional = undefined
        global additive_order = undefined
        global base_ring = undefined
        global base_field = undefined
        global basis = undefined
        global category = undefined
        global charpoly = undefined
        global characteristic_polynomial = undefined
        global coerce = undefined
        global cyclotomic_polynomial = undefined
        global decomposition = undefined
        global denominator = undefined
        global det = undefined
        global dimension = undefined
        global dim = undefined
        global discriminant = undefined
        global disc = undefined
        global eta = undefined
        global fcp = undefined
        global gen = undefined
        global gens = undefined
        global hecke_operator = undefined
        global image = undefined
        global integral = undefined
        global integrate = undefined
        global integral_closure = undefined
        global interval = undefined
        global xinterval = undefined
        global is_commutative = undefined
        global is_even = undefined
        global is_integrally_closed = undefined
        global is_field = undefined
        global is_odd = undefined
        global kernel = undefined
        global krull_dimension = undefined
        global lift = undefined
        global log = undefined
        global log_b = undefined
        global minimal_polynomial = undefined
        global minpoly = undefined
        global multiplicative_order = undefined
        global ngens = undefined
        global norm = undefined
        global numerator = undefined
        global numerical_approx = undefined
        global n = undefined
        global N = undefined
        global objgens = undefined
        global objgen = undefined
        global order = undefined
        global rank = undefined
        global regulator = undefined
        global round = undefined
        global quotient = undefined
        global quo = undefined
        global isqrt = undefined
        global squarefree_part = undefined
        global symbolic_sum = undefined
        global sum = undefined
        global transpose = undefined
     89                         base_ring,
     90                         base_field,
     91                         basis,
     92                         category,
     93                         charpoly,
     94                         characteristic_polynomial,
     95                         coerce,
     96                         cyclotomic_polynomial,
     97                         decomposition,
     98                         denominator,
     99                         det,
    100                         dimension,
    101                         dim,
    102                         discriminant,
    103                         disc,

/home/grant/SageMath/local/lib/python2.7/site-packages/sage/misc/functional.py 
in <module>()
     17 #
     18 # This program is free software: you can redistribute it and/or modify
     19 # it under the terms of the GNU General Public License as published by
     20 # the Free Software Foundation, either version 2 of the License, or
     21 # (at your option) any later version.
     22 #                  http://www.gnu.org/licenses/
     23 
#*****************************************************************************
     24 from __future__ import absolute_import
     25 from six.moves import range
     26 from six.moves import builtins
     27 
     28 import sage.misc.latex
     29 import sage.interfaces.expect
     30 import sage.interfaces.mathematica
     31 
---> 32 from sage.rings.complex_double import CDF
        global sage.rings.complex_double = undefined
        global CDF = undefined
     33 from sage.rings.real_double import RDF, RealDoubleElement
     34 
     35 import sage.rings.real_mpfr
     36 import sage.rings.complex_field
     37 import sage.rings.integer
     38 
     39 
##############################################################################
     40 # There are many functions on elements of a ring, which mathematicians
     41 # usually write f(x), e.g., it is weird to write x.log() and natural
     42 # to write log(x).  The functions below allow for the more familiar 
syntax.
     43 
##############################################################################
     44 def additive_order(x):
     45     """
     46     Returns the additive order of `x`.
     47 

ImportError: libgfortran.so.3: cannot open shared object file: No such file or 
directory

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

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