I failed again and again installing python3.8 on my ubuntu 21.04
Now it is 'ok' but this error message appears from pip (and import ctypes doesn't work too):
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/local/lib/python3.8/site-packages/setuptools/__init__.py", line 20, in <module>
from setuptools.dist import Distribution, Feature
File "/usr/local/lib/python3.8/site-packages/setuptools/dist.py", line 35, in <module>
from setuptools import windows_support
File "/usr/local/lib/python3.8/site-packages/setuptools/windows_support.py", line 2, in <module>
import ctypes
File "/usr/local/lib/python3.8/ctypes/__init__.py", line 7, in <module>
from _ctypes import Union, Structure, Array
File "/usr/local/lib/python3.8/_ctypes/__init__.py", line 8, in <module>
from _ctypes import Union, Structure, Array
ImportError: cannot import name 'Union' from partially initialized module '_ctypes' (most likely due to a circular import) (/usr/local/lib/python3.8/_ctypes/__init__.py)
python2
package.pyenv
orupdate-alternatives
?