更新后运行Jupyter Lab / Notebook和大多数Conda命令时出错

Question

[尝试更新conda程序包后，我不再能够启动Jupyter Notebook或Jupyter Lab。大多数conda命令还会导致终端错误。尽管每个命令都会导致略有不同的错误，但每个命令都会以以下语句终止：

ImportError: dlopen(/Users/USERNAME/anaconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so, 2): Library not loaded: @rpath/libffi.6.dylib
  Referenced from: /Users/USERNAME/anaconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so
  Reason: image not found

例如，尝试运行jupyter实验室结果：

Traceback (most recent call last):
  File "/Users/USERNAME/anaconda3/lib/python3.7/site-packages/jupyterlab_server/server.py", line 14, in <module>
    from notebook.base.handlers import (
  File "/Users/USERNAME/anaconda3/lib/python3.7/site-packages/notebook/base/handlers.py", line 35, in <module>
    from notebook.utils import is_hidden, url_path_join, url_is_absolute, url_escape
  File "/Users/USERNAME/anaconda3/lib/python3.7/site-packages/notebook/utils.py", line 10, in <module>
    import ctypes
  File "/Users/USERNAME/anaconda3/lib/python3.7/ctypes/__init__.py", line 7, in <module>
    from _ctypes import Union, Structure, Array
ImportError: dlopen(/Users/USERNAME/anaconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so, 2): Library not loaded: @rpath/libffi.6.dylib
  Referenced from: /Users/USERNAME/anaconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so
  Reason: image not found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/USERNAME/anaconda3/bin/jupyter-lab", line 5, in <module>
    from jupyterlab.labapp import main
  File "/Users/USERNAME/anaconda3/lib/python3.7/site-packages/jupyterlab/labapp.py", line 14, in <module>
    from jupyterlab_server import slugify, WORKSPACE_EXTENSION
  File "/Users/USERNAME/anaconda3/lib/python3.7/site-packages/jupyterlab_server/__init__.py", line 4, in <module>
    from .app import LabServerApp
  File "/Users/USERNAME/anaconda3/lib/python3.7/site-packages/jupyterlab_server/app.py", line 9, in <module>
    from .server import ServerApp
  File "/Users/USERNAME/anaconda3/lib/python3.7/site-packages/jupyterlab_server/server.py", line 26, in <module>
    from jupyter_server.base.handlers import (                          # noqa
  File "/Users/USERNAME/anaconda3/lib/python3.7/site-packages/jupyter_server/base/handlers.py", line 34, in <module>
    from jupyter_server.utils import is_hidden, url_path_join, url_is_absolute, url_escape
  File "/Users/USERNAME/anaconda3/lib/python3.7/site-packages/jupyter_server/utils.py", line 10, in <module>
    import ctypes
  File "/Users/USERNAME/anaconda3/lib/python3.7/ctypes/__init__.py", line 7, in <module>
    from _ctypes import Union, Structure, Array
ImportError: dlopen(/Users/USERNAME/anaconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so, 2): Library not loaded: @rpath/libffi.6.dylib
  Referenced from: /Users/USERNAME/anaconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so
  Reason: image not found

尝试使用自制程序重新安装libffi（如在其他地方建议的操作也失败。

非常感谢您提供有关恢复和运行的帮助。

Answer 1

我也有类似的问题，需要将libffi降级到3.2.1版。

我从未明确安装libffi；它与原始环境创建一起出现。

尝试一下

% conda install libffi=3.2.1

我能够安装许多软件包，但出现故障nb_conda_kernels和各种jupyter实验室扩展安装。