I'm trying to install numpy for python3.10 (not in a venv). I installed python 3.10 using

sudo apt install python3.10

pip didn't seem to be installed so I did

jeremy@jeremy-Blade:/$ python3.10 -m pip install numpy

jeremy@jeremy-Blade:/$ wget https://bootstrap.pypa.io/get-pip.py

jeremy@jeremy-Blade:/$ python3.10 get-pip.py

jeremy@jeremy-Blade:/$ python3.10 -m pip --version 

pip 21.3.1 from /home/jeremy/.local/lib/python3.10/site-packages/pip (python 3.10)

and then tried

jeremy@jeremy-Blade:/$ python3.10 -m pip install numpy

Defaulting to user installation because normal site-packages is not writeable

Requirement already satisfied: numpy in /usr/lib/python3/dist-packages (1.17.4)

But when I try to import numpy :

Python 3.10.0 (default, Oct  4 2021, 22:09:55) [GCC 9.3.0] on linux

Type "help", "copyright", "credits" or "license" for more information.

>>> import numpy 

Traceback (most recent call last):

  File "/usr/lib/python3/dist-packages/numpy/core/__init__.py", line 17, in <module>

    from . import multiarray

  File "/usr/lib/python3/dist-packages/numpy/core/multiarray.py", line 14, in <module>

    from . import overrides

  File "/usr/lib/python3/dist-packages/numpy/core/overrides.py", line 7, in <module>

    from numpy.core._multiarray_umath import (

ModuleNotFoundError: No module named 'numpy.core._multiarray_umath'



During handling of the above exception, another exception occurred:



Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/usr/lib/python3/dist-packages/numpy/__init__.py", line 142, in <module>

    from . import core

  File "/usr/lib/python3/dist-packages/numpy/core/__init__.py", line 47, in <module>

    raise ImportError(msg)

ImportError: 



IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!



Importing the numpy c-extensions failed.

- Try uninstalling and reinstalling numpy.

- If you have already done that, then:

  1. Check that you expected to use Python3.10 from "/usr/bin/python3.10",

     and that you have no directories in your PATH or PYTHONPATH that can

     interfere with the Python and numpy version "1.17.4" you're trying to use.

  2. If (1) looks fine, you can open a new issue at

     https://github.com/numpy/numpy/issues.  Please include details on:

     - how you installed Python

     - how you installed numpy

     - your operating system

     - whether or not you have multiple versions of Python installed

     - if you built from source, your compiler versions and ideally a build log

...

Original error was: No module named 'numpy.core._multiarray_umath'

my path is

jeremy@jeremy-Blade:/$env|grep PATH

LD_LIBRARY_PATH=/usr/local/cuda-10.2/targets/x86_64-linux/lib/stubs

PATH=/home/jeremy/.local/bin:/usr/local/cuda-10.2/bin:/usr/local/cuda-10.2/targets/x86_64-linux/lib/stubs:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

(so PYTHONPATH is not set - if I do set it to /usr/bin/python3.10 this doesn't seem to change anything) , and following the recommendations in the error message I don't seem to see any problem here. (I uninstalled and reinstalled numpy for python3.10, no change seen in problem)
My OS is ubuntu 20.04.
Sorry if this is something obvious or unrelated to numpy.