Не работает pip --version после создания виртуального окружения python в linux

pip --version
Traceback (most recent call last):
  File "/home/ryan/venv/bin/pip", line 5, in <module>
    from pip._internal import main
  File "/home/ryan/venv/lib/python3.8/site-packages/pip/_internal/__init__.py", line 40, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/home/ryan/venv/lib/python3.8/site-packages/pip/_internal/cli/autocompletion.py", line 8, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/home/ryan/venv/lib/python3.8/site-packages/pip/_internal/cli/main_parser.py", line 12, in <module>
    from pip._internal.commands import (
  File "/home/ryan/venv/lib/python3.8/site-packages/pip/_internal/commands/__init__.py", line 6, in <module>
    from pip._internal.commands.completion import CompletionCommand
  File "/home/ryan/venv/lib/python3.8/site-packages/pip/_internal/commands/completion.py", line 6, in <module>
    from pip._internal.cli.base_command import Command
  File "/home/ryan/venv/lib/python3.8/site-packages/pip/_internal/cli/base_command.py", line 18, in <module>
    from pip._internal.download import PipSession
  File "/home/ryan/venv/lib/python3.8/site-packages/pip/_internal/download.py", line 38, in <module>
    from pip._internal.utils.glibc import libc_ver
  File "/home/ryan/venv/lib/python3.8/site-packages/pip/_internal/utils/glibc.py", line 3, in <module>
    import ctypes
  File "/usr/local/lib/python3.8/ctypes/__init__.py", line 7, in <module>
    from _ctypes import Union, Structure, Array
ModuleNotFoundError: No module named '_ctypes'