Ubuntu 20.04 Focal Fossa

Dear all,

Here follows attached a sage crash report. I think the sage install was broken by installation of Blender.


Sage was installed this way on my fresh Ubuntu 20.04 Focal Fossa:

sudo apt install sagemath sagetex- texlive-latex-base- sagemath-jupyter- 
pari-doc- sagemath-doc-

(afterwards I did

sudo apt install jupyter

and

sudo apt install sagemath-jupyter

everything was working fine)


Today I installed Blender

  sudo add-apt-repository ppa:savoury1/ffmpeg4

  sudo add-apt-repository ppa:savoury1/blender

  sudo apt-get update

  sudo apt-get upgrade && sudo apt-get dist-upgrade

  sudo apt-get install blender


Afterwards

I tried the command

|maxima('plotdf([-y,-x],[x,y],[x,-2,2],[y,-2,2])') |

in the jupyter notebook and I got a missing Kernel error

afterwards the kernel would not restart successfully and I restarted my computer.


Then I run

sage

in the terminal, which generated this crash report.

Currently, Sage is not working anymore on my computer.


There are strange things about python and numpy written in Blender's ppa description. I attach this description too (see lines 23 and 43).

I checked the result of python3 --version in the terminal and got

Python 3.8.10


Any hint towards the resolution of this sad situation is welcome.

Thanks fo your work on Sage.


Best,

Gaël Cousin.




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

IPython post-mortem report

{'commit_hash': '<not found>',
 'commit_source': '(none found)',
 'default_encoding': 'utf-8',
 'ipython_path': '/usr/lib/python3/dist-packages/IPython',
 'ipython_version': '7.13.0',
 'os_name': 'posix',
 'platform': 'Linux-5.10.0-1038-oem-x86_64-with-glibc2.29',
 'sys_executable': '/usr/bin/python3',
 'sys_platform': 'linux',
 'sys_version': '3.8.10 (default, Jun  2 2021, 10:49:15) \n[GCC 9.4.0]'}

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



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

Crash traceback:

---------------------------------------------------------------------------
---------------------------------------------------------------------------
ImportError                                 Python 3.8.10: /usr/bin/python3
                                                   Mon Aug 16 16:37:37 2021
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.
/usr/share/sagemath/bin/sage-ipython in <module>
      1 #!/usr/bin/env sage-python
      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 TerminalIPythonApp.initialize of 
<sage.repl.interpreter.SageTerminalApp object at 0x7fd1dccd5070>>
     16 app.start()

<decorator-gen-113> in initialize(self=<sage.repl.interpreter.SageTerminalApp 
object>, argv=None)

/usr/lib/python3/dist-packages/traitlets/config/application.py in 
catch_config_error(method=<function TerminalIPythonApp.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 TerminalIPythonApp.initialize at 0x7fd1db5265e0>
        app = <sage.repl.interpreter.SageTerminalApp object at 0x7fd1dccd5070>
        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 

/usr/lib/python3/dist-packages/IPython/terminal/ipapp.py in 
initialize(self=<sage.repl.interpreter.SageTerminalApp object>, argv=None)
    302 
    303         return super(TerminalIPythonApp, self).parse_command_line(argv)
    304     
    305     @catch_config_error
    306     def initialize(self, argv=None):
    307         """Do actions after construct, but before starting the app."""
    308         super(TerminalIPythonApp, self).initialize(argv)
    309         if self.subapp is not None:
    310             # don't bother initializing further, starting subapp
    311             return
    312         # print self.extra_args
    313         if self.extra_args and not self.something_to_run:
    314             self.file_to_run = self.extra_args[0]
    315         self.init_path()
    316         # create the shell
--> 317         self.init_shell()
        self.init_shell = <bound method SageTerminalApp.init_shell of 
<sage.repl.interpreter.SageTerminalApp object at 0x7fd1dccd5070>>
    318         # and draw the banner
    319         self.init_banner()
    320         # Now a variety of things that happen after the banner is 
printed.
    321         self.init_gui_pylab()
    322         self.init_extensions()
    323         self.init_code()
    324 
    325     def init_shell(self):
    326         """initialize the InteractiveShell instance"""
    327         # Create an InteractiveShell instance.
    328         # shell.display_banner should always be False for the terminal
    329         # based app, because we call shell.show_banner() by hand below
    330         # so the banner shows *before* all extension loading stuff.
    331         self.shell = self.interactive_shell_class.instance(parent=self,
    332                         profile_dir=self.profile_dir,

/usr/lib/python3/dist-packages/sage/repl/interpreter.py in 
init_shell(self=<sage.repl.interpreter.SageTerminalApp object>)
    727         self.shell.has_sage_extensions = SAGE_EXTENSION in 
self.extensions
    728 
    729         # Load the %lprun extension if available
    730         try:
    731             import line_profiler
    732         except ImportError:
    733             pass
    734         else:
    735             self.extensions.append('line_profiler')
    736 
    737         if self.shell.has_sage_extensions:
    738             self.extensions.remove(SAGE_EXTENSION)
    739 
    740             # load sage extension here to get a crash if
    741             # something is wrong with the sage library
--> 742             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 0x7fd1d967e7c0>>
        global SAGE_EXTENSION = 'sage'
    743 
    744 

/usr/lib/python3/dist-packages/IPython/core/extensions.py in 
load_extension(self=<IPython.core.extensions.ExtensionManager object>, 
module_str='sage')
     72         if module_str in self.loaded:
     73             return "already loaded"
     74 
     75         from IPython.utils.syspathcontext import prepended_to_syspath
     76 
     77         with self.shell.builtin_trap:
     78             if module_str not in sys.modules:
     79                 with prepended_to_syspath(self.ipython_extension_dir):
     80                     mod = import_module(module_str)
     81                     if 
mod.__file__.startswith(self.ipython_extension_dir):
     82                         print(("Loading extensions from {dir} is 
deprecated. "
     83                                "We recommend managing extensions like 
any "
     84                                "other Python packages, in 
site-packages.").format(
     85                               
dir=compress_user(self.ipython_extension_dir)))
     86             mod = sys.modules[module_str]
---> 87             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 0x7fd1d967e7c0>>
        mod = <module 'sage' from 
'/usr/lib/python3/dist-packages/sage/__init__.py'>
     88                 self.loaded.add(module_str)
     89             else:
     90                 return "no load function"
     91 
     92     def unload_extension(self, module_str):
     93         """Unload an IPython extension by its module name.
     94 
     95         This function looks up the extension's name in ``sys.modules`` 
and
     96         simply calls ``mod.unload_ipython_extension(self)``.
     97         
     98         Returns the string "no unload function" if the extension 
doesn't define
     99         a function to unload itself, "not loaded" if the extension 
isn't loaded,
    100         otherwise None.
    101         """
    102         if module_str not in self.loaded:

/usr/lib/python3/dist-packages/IPython/core/extensions.py in 
_call_load_ipython_extension(self=<IPython.core.extensions.ExtensionManager 
object>, mod=<module 'sage' from 
'/usr/lib/python3/dist-packages/sage/__init__.py'>)
    119         """
    120         from IPython.utils.syspathcontext import prepended_to_syspath
    121 
    122         if (module_str in self.loaded) and (module_str in sys.modules):
    123             self.unload_extension(module_str)
    124             mod = sys.modules[module_str]
    125             with prepended_to_syspath(self.ipython_extension_dir):
    126                 reload(mod)
    127             if self._call_load_ipython_extension(mod):
    128                 self.loaded.add(module_str)
    129         else:
    130             self.load_extension(module_str)
    131 
    132     def _call_load_ipython_extension(self, mod):
    133         if hasattr(mod, 'load_ipython_extension'):
--> 134             mod.load_ipython_extension(self.shell)
        mod.load_ipython_extension = <function load_ipython_extension at 
0x7fd1dcc44040>
        self.shell = <sage.repl.interpreter.SageTerminalInteractiveShell object 
at 0x7fd1db4c09d0>
    135             return True
    136 
    137     def _call_unload_ipython_extension(self, mod):
    138         if hasattr(mod, 'unload_ipython_extension'):
    139             mod.unload_ipython_extension(self.shell)
    140             return True
    141 
    142     @undoc
    143     def install_extension(self, url, filename=None):
    144         """
    145         Deprecated.
    146         """
    147         # Ensure the extension directory exists
    148         raise DeprecationWarning(
    149             '`install_extension` and the `install_ext` magic have been 
deprecated since IPython 4.0'

/usr/lib/python3/dist-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 0x7fd1d943baf0>
        args = (<sage.repl.interpreter.SageTerminalInteractiveShell object at 
0x7fd1db4c09d0>,)
     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)

/usr/lib/python3/dist-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 
0x7fd1db4c09d0>,)
        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)

/usr/lib/python3/dist-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 
0x7fd1db4c09d0>

/usr/lib/python3/dist-packages/sage/repl/ipython_extension.py in 
__init__(self=<sage.repl.ipython_extension.SageCustomizations object>, 
shell=<sage.repl.interpreter.SageTerminalInteractiveShell object>)
    420     def __init__(self, shell=None):
    421         """
    422         Initialize the Sage plugin.
    423         """
    424         self.shell = shell
    425 
    426         self.auto_magics = SageMagics(shell)
    427         self.shell.register_magics(self.auto_magics)
    428 
    429         import sage.misc.edit_module as edit_module
    430         self.shell.set_hook('editor', edit_module.edit_devel)
    431 
    432         self.init_inspector()
    433         self.init_line_transforms()
    434 
--> 435         import sage.all # until sage's import hell is fixed
        sage.all = undefined
    436 
    437         self.shell.verbose_quit = True
    438         self.set_quit_hook()
    439 
    440         self.register_interface_magics()
    441 
    442         if SAGE_IMPORTALL == 'yes':
    443             self.init_environment()
    444 
    445     def register_interface_magics(self):
    446         """
    447         Register magics for each of the Sage interfaces
    448         """
    449         from sage.repl.interface_magic import InterfaceMagic
    450         InterfaceMagic.register_all(self.shell)

/usr/lib/python3/dist-packages/sage/all.py in <module>
     91 warnings.filterwarnings('ignore', category=RuntimeWarning,
     92   message=r"'sin' and 'sout' swap memory stats couldn't be determined")
     93 from sage.misc.all       import *         # takes a while
     94 from sage.typeset.all    import *
     95 from sage.repl.all       import *
     96 
     97 from sage.misc.sh import sh
     98 
     99 from sage.libs.all       import *
    100 from sage.data_structures.all import *
    101 from sage.doctest.all    import *
    102 
    103 from sage.structure.all  import *
    104 from sage.rings.all      import *
    105 from sage.arith.all      import *
--> 106 from sage.matrix.all     import *
        global sage.matrix.all = undefined
    107 
    108 from sage.symbolic.all   import *
    109 from sage.modules.all    import *
    110 from sage.monoids.all    import *
    111 from sage.algebras.all   import *
    112 from sage.modular.all    import *
    113 from sage.sat.all        import *
    114 from sage.schemes.all    import *
    115 from sage.graphs.all     import *
    116 from sage.groups.all     import *
    117 from sage.arith.power    import generic_power as power
    118 from sage.databases.all  import *
    119 from sage.categories.all import *
    120 from sage.sets.all       import *
    121 from sage.probability.all import *

/usr/lib/python3/dist-packages/sage/matrix/__init__.py in <module>
      1 # Resolve a cyclic import
----> 2 import sage.matrix.args
        global sage.matrix.args = undefined

/usr/lib/python3/dist-packages/sage/matrix/args.pyx in init sage.matrix.args 
(build/cythonized/sage/matrix/args.c:21273)()
      8 #       Copyright (C) 2018 Jeroen Demeyer <j.deme...@ugent.be>
      9 #
     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 cimport cython
     18 from cpython.sequence cimport PySequence_Fast
     19 from cysignals.signals cimport sig_check
     20 from cypari2.gen cimport Gen
     21 from cypari2.types cimport typ, t_MAT, t_VEC, t_COL, t_VECSMALL, 
t_LIST, t_STR, t_CLOSURE
     22 
---> 23 from .matrix_space import MatrixSpace
        global matrix_space = undefined
        global MatrixSpace = undefined
     24 from sage.rings.all import ZZ, RDF, CDF
     25 from sage.structure.coerce cimport (coercion_model,
     26         is_numpy_type, py_scalar_parent)
     27 from sage.structure.element cimport Element, RingElement, Vector
     28 from sage.arith.long cimport pyobject_to_long
     29 from sage.misc.misc_c import sized_iter
     30 from sage.categories import monoids
     31 
     32 
     33 CommutativeMonoids = monoids.Monoids().Commutative()
     34 
     35 
     36 cdef inline bint element_is_scalar(Element x):
     37     """
     38     Should this element be considered a scalar (as opposed to a vector)?

/usr/lib/python3/dist-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

ImportError: 
/usr/lib/python3/dist-packages/sage/matrix/matrix_modn_sparse.cpython-38-x86_64-linux-gnu.so:
 undefined symbol: 
_ZNK6Givaro7IntegercvNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEB5cxx11Ev

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

History of session input:
*** Last line of input (may not be in above history):
gael@gael-XPS-13-9310:~$ sudo add-apt-repository ppa:savoury1/blender
[sudo] Mot de passe de gael : 
 New builds of Blender 2.93.2 (and Blender 3.0.0 Alpha) for Xenial & newer.

Update (26 Feb 2021): Blender 2.92.0+ supports building CUDA kernels with a 
combination of CUDA 10.2 and 11.3 (covering SM_30 through SM_8x). Also, Blender 
>= 2.93 requires OpenColorIO >= 2.0.0 so OpenColorIO 1.1.1 is now packaged as 
opencolorio1 (providing libopencolorio1{-dev} packages) such that each 
OpenColorIO version can be used for different builds as needed.

Update (29 Sep 2020): Blender 2.91.0 Alpha and newer builds now with USD 
(Universal Scene Description) support plus pre-compiled CUDA 11.1 kernels.

* Note: Both blender and blender-git versions can easily be co-installed on the 
same system, via packaging various blender* files as blender-git* to ensure no 
file conflicts between the two packages. Plus they also use distinct config 
paths (~/.config/blender/2.93 and ~/.config/blender/3.0).

These are fresh builds with as many features enabled as possible. Making use of 
work by Irie Shinsuke [1], Thomas Schiex [2] & Debian's multimedia packaging 
team (thank you all!) and developing that work further this is a fairly 
complete and up-to-date Blender build. Packages found here that are not in 
default Debian/Ubuntu repos include: Alembic, Open Image Denoise, Open Shading 
Language, Partio, Ptex, & Universal Scene Description (USD).

*** Donations: https://ko-fi.com/savoury1 & https://paypal.me/Savoury1 ***

If you find this PPA useful then please consider a donation (above links). It 
will help me continue the efforts providing up-to-date Blender for all!

==========================================================================
                  Blender - fresh builds (Xenial & newer)
==========================================================================

alembic-io (1.8.2), blender (2.93.2), blender-git (3.0.0 Alpha 20210716), 
collada-dom (2.5.0), embree (3.12.2), ilmbase (3.1.0 = imath), libde265 
(1.0.8), libheif (1.12.0), libraw (0.20.2), libsdl2 (2.0.14), llvm-toolchain-11 
(11.0.1), mpdecimal (2.5.1), nanovdb (0.1.0), opencollada (1.6.68), 
opencolorio1 (1.1.1), opencolorio (2.0.1), opencv (imath rebuilds), openexr 
(3.0.5), openimagedenoise (1.4.1), openimageio (2.2.16.0), openscenegraph 
(3.6.5), openshadinglanguage (1.11.14.1), opensubdiv (3.4.4), openvdb (8.1.0), 
partio (1.14.0), ptex (2.4.0+git20210629), pystring (1.1.3+git20200203), 
python3.9 (3.9.6), robin-map (0.6.3), tbb (2020.3), usd (21.02), yaml-cpp 
(0.6.3)

Focal only: pyside2 (5.14.0+really5.13.2 downgrade, due various use cases being 
broken by Focal pyside2 5.14 plus Qt 5.12, eg. missing pyside2-uic)

Xenial & Bionic: armadillo, boost1.71, cfitsio, charls, coin3 (4.0.0), curl, 
dcmtk, collada2gltf, fftw3, fontconfig, freetype, gdal, gdcm, geos, hwloc, icu 
(66.1), jemalloc (5.2.1), json-c4, lapack, libdap, libevent, libgeotiff, 
libidn2, libpng1.6, libpsl5, libzstd, mpich, netcdf, ogdi, openjpeg2, openssl, 
poppler, pmix, proj, pugixml, pysimplesoap, python-{boto,httplib2,imaplib2} 
(compat with new openssl), superlu, tesseract, tiff, xerces-c, xz-utils, zlib1g

Xenial only: hdf5, icu60, icu-le-hb, infinipath-psm, libfabric, libharu, 
libkml, libsquish, libwebp, nghttp2, rdma-core

Note: Many above deps for Xenial & Bionic are interconnected and have been 
copied here from other PPAs at this Launchpad site to make installation of the 
latest Blender on older series easier, without needing too many PPAs.

==========================================================================

*** Install ***

NOTE FOR ALL: Blender here is built with ppa:savoury1/ffmpeg4 (the latest 
stable release of FFmpeg 4.x) which PPA must also be added for install of 
Blender. Thus, these are the steps required for a successful installation:

  sudo add-apt-repository ppa:savoury1/ffmpeg4
  sudo add-apt-repository ppa:savoury1/blender
  sudo apt-get update
  sudo apt-get upgrade && sudo apt-get dist-upgrade
  sudo apt-get install blender

* Notes about Numpy: Due Blender 2.93+ needing Python 3.9+ (Xenial is 3.5, 
Bionic 3.6, and Focal 3.8) Blender here is built with Python 3.9 for all 
series. Numpy from python3-numpy (to /usr/lib/python3/dist-packages) will 
therefore not work with Python 3.9 used by Blender for Focal and earlier. A 
workaround is to install Numpy through pip then add a user site-packages path 
to sys.path in a startup script (following steps outlined below).

All blender{-git}-data packages here depend on python3.9{-distutils} to ensure 
a complete Python 3.9 install is available. The following commands using Python 
3.9 will install pip first and then a compatible Python Numpy package 
(bootstrap.pypa.io is hosted by Python Packaging Authority or PyPA so it's a 
trusted site in terms of downloading get-pip.py to install pip):

cd ~
curl https://bootstrap.pypa.io/get-pip.py | python3.9
python3.9 -m pip install --target=.local/lib/python3.9/site-packages numpy

Then a Blender startup script can be added, using the path for user config 
files. Use "~/.config/blender/2.93/scripts/startup" for 2.93 and create a file 
such as usercustomize.py (change "USER" in the below to the logged in username 
on your system) with contents such as the following two lines:

import sys
sys.path.insert(0, '/home/USER/.local/lib/python3.9/site-packages')

The result will be that "import numpy" works fine after loading Blender on 
older series (ie. Xenial or Bionic) making Numpy functionality available.

Notes for Xenial & Bionic: Blender is demanding software. Recent versions 
require many newer system libraries than shipped with these older series. 
Packages here are built against various other PPAs at this Launchpad site (see 
"Build" section below) and require various newer packages from those PPAs to 
successfully install. This includes requiring GCC 9.3.0 (default GCC for Focal) 
as Blender here is built with GCC 9.3.0 as the minimum.

Thus, installing Blender from this PPA requires extra steps for Xenial & Bionic 
(many dependencies from backports, graphics & multimedia PPAs are now copied 
here, so those PPAs should not need to be added -- if you find a dependency 
still missing after the below steps please do let me know!):

  sudo add-apt-repository ppa:savoury1/gcc-defaults-9
  sudo add-apt-repository ppa:savoury1/ffmpeg4
  sudo add-apt-repository ppa:savoury1/display
  sudo add-apt-repository ppa:savoury1/blender
  sudo apt-get update
  sudo apt-get upgrade && sudo apt-get dist-upgrade
  sudo apt-get install blender

Understand this will bring many upgrades including to GCC 9.3.0 which will be 
made the system default GCC version. As always, please remember that it is wise 
to backup first before such a major upgrade process is undertaken!

If running nVidia hardware see the display PPA for more information about 
nVidia drivers: https://launchpad.net/~savoury1/+archive/ubuntu/display

Note for Xenial: CUDA 11.1+ requires Linux kernel >= 4.5 for bug-free 
functionality, just as a newer kernel is best for numerous post-Xenial release 
(2016 onwards) display drivers and graphics programs. See here:

https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html

See the same display PPA above re: kernel >= 4.5 for new display drivers.

*** Build ***

This PPA has build dependencies on:

  ppa:savoury1/build-tools
  ppa:savoury1/backports
  ppa:savoury1/graphics
  ppa:savoury1/multimedia
  ppa:savoury1/ffmpeg4

Additionally, required by Xenial & Bionic:

  ppa:savoury1/haskell-build
  ppa:savoury1/tex-2019
  ppa:savoury1/python
  ppa:savoury1/display  
  ppa:savoury1/gcc-defaults-9
  ppa:savoury1/llvm-defaults-10
  ppa:savoury1/boost-defaults1.71

Note about i386: Blender is not a good match for i386 arch and 2.90+ fails to 
build on i386 even after carefully removing all amd64 only configs and deps. 
The Blender packages built here will thus always be amd64 only, as that is 
clearly the target architecture for all features. Bye bye i386!

*** Credits ***

- Creators of Blender: The Blender Foundation and Blender Institute
  https://www.blender.org/about/

- Package code for Blender: Debian Multimedia Maintainers
  https://tracker.debian.org/pkg/blender

- Python 3.9 packages: Now provided by backports from ppa:savoury1/python
  with packaging hints and ideas from Felix Krull & the "deadsnakes" team
  (https://launchpad.net/~deadsnakes), whose packages were formerly here.

- Package code for Alembic and Open Image Denoise: Irie Shinsuke

- Package code for Open Shading Language: Irie Shinsuke & Thomas Schiex

[1] https://launchpad.net/~irie/+archive/ubuntu/blender-builddep

[2] https://launchpad.net/~thomas-schiex/+archive/ubuntu/blender
 Plus d’info : https://launchpad.net/~savoury1/+archive/ubuntu/blender

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