AttributeError: module 'zstandard' has no attribute '__version__'

Comienza con urllib3/connectionpool.py y response.py, donde el traceback lee zstandard.version, y después inspecciona cómo se expone el módulo zstandard instalado tras una actualización de conda. Reproduce el fallo mediante el punto de entrada de conda y verifica que la creación de un entorno o la instalación de un paquete se complete sin el traceback.

Hi, I did the conda update this morning, with the command conda update conda, but at the end I got this message:

Traceback (most recent call last):
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/exceptions.py", line 1124, in call
return func(*args, **kwargs)
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/cli/main.py", line 57, in main_subshell
p = generate_parser()
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/cli/conda_argparse.py", line 40, in generate_parser
p = ArgumentParser(
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/cli/conda_argparse.py", line 117, in init
self._subcommands = context.plugin_manager.get_hook_results("subcommands")
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/base/context.py", line 422, in plugin_manager
from ..plugins.manager import get_plugin_manager
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/plugins/init.py", line 3, in
from .hookspec import hookimpl # noqa: F401
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/plugins/hookspec.py", line 10, in
from .types import CondaSolver, CondaSubcommand, CondaVirtualPackage
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/plugins/types.py", line 6, in
from ..core.solve import Solver
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/core/solve.py", line 15, in
from .index import get_reduced_index, _supplement_index_with_system
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/core/index.py", line 10, in
from .package_cache_data import PackageCacheData
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/core/package_cache_data.py", line 22, in
from .path_actions import CacheUrlAction, ExtractPackageAction
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/core/path_actions.py", line 28, in
from ..gateways.connection.download import download
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/gateways/connection/init.py", line 6, in
from requests import ConnectionError, HTTPError, Session
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/requests/init.py", line 43, in
import urllib3
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/urllib3/init.py", line 18, in
from .connectionpool import HTTPConnectionPool, HTTPSConnectionPool, connection_from_url
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/urllib3/connectionpool.py", line 15, in
from ._request_methods import RequestMethods
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/urllib3/_request_methods.py", line 10, in
from .response import BaseHTTPResponse
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/urllib3/response.py", line 38, in
map(int, re.search(r"^([0-9]+).([0-9]+)", zstd.version).groups()) # type: ignore[union-attr]
AttributeError: module 'zstandard' has no attribute 'version'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/bioinfo/mambaforge-pypy3/bin/conda", line 13, in
sys.exit(main())
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/cli/main.py", line 112, in main
return conda_exception_handler(main, *args, **kwargs)
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/exceptions.py", line 1424, in conda_exception_handler
return_value = exception_handler(func, *args, **kwargs)
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/exceptions.py", line 1127, in call
return self.handle_exception(exc_val, exc_tb)
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/exceptions.py", line 1167, in handle_exception
return self.handle_unexpected_exception(exc_val, exc_tb)
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/exceptions.py", line 1178, in handle_unexpected_exception
self.print_unexpected_error_report(error_report)
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/exceptions.py", line 1240, in print_unexpected_error_report
from .cli.main_info import get_env_vars_str, get_main_info_str
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/cli/main_info.py", line 17, in
from ..core.index import _supplement_index_with_system
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/core/index.py", line 10, in
from .package_cache_data import PackageCacheData
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/core/package_cache_data.py", line 22, in
from .path_actions import CacheUrlAction, ExtractPackageAction
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/core/path_actions.py", line 28, in
from ..gateways.connection.download import download
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/conda/gateways/connection/init.py", line 6, in
from requests import ConnectionError, HTTPError, Session
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/requests/init.py", line 43, in
import urllib3
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/urllib3/init.py", line 18, in
from .connectionpool import HTTPConnectionPool, HTTPSConnectionPool, connection_from_url
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/urllib3/connectionpool.py", line 15, in
from ._request_methods import RequestMethods
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/urllib3/_request_methods.py", line 10, in
from .response import BaseHTTPResponse
File "/home/bioinfo/mambaforge-pypy3/lib/pypy3.9/site-packages/urllib3/response.py", line 38, in
map(int, re.search(r"^([0-9]+).([0-9]+)", zstd.version).groups()) # type: ignore[union-attr]
AttributeError: module 'zstandard' has no attribute 'version'

now if I try to create a virtual environment or install something with conda I get the same message

My OS is UBUNTU 20.04 LTS

How can fix the problem?

Thanks