内核说正在连接，然后说没有内核 |断开连接。
我已经完全卸载了 anaconda 并使用卸载了所有 jupyter
python -m pip uninstall -y jupyter jupyter_core jupyter-client jupyter-console jupyterlab_pygments notebook qtconsole nbconvert nbformat
在主目录中搜索 anaconda 或 jupyter 一无所获。
然后，我重新安装了 anaconda，但问题仍然存在。
起初，似乎内核正在连接一个新笔记本，但一段时间后内核连接到一个新笔记本。 （更新：我发现新笔记本一直连接到内核，直到打开旧笔记本。打开旧笔记本之后，没有笔记本连接到内核）
我一直坚持这个。
以下是我在终端中得到的：
[I 2021-08-01 21:01:42.797 ServerApp] nbclassic | extension was successfully linked.
[I 2021-08-01 21:01:42.846 LabApp] JupyterLab extension loaded from /home/username/anaconda3/lib/python3.8/site-packages/jupyterlab
[I 2021-08-01 21:01:42.846 LabApp] JupyterLab application directory is /home/username/anaconda3/share/jupyter/lab
[I 2021-08-01 21:01:42.849 ServerApp] jupyterlab | extension was successfully loaded.
[I 2021-08-01 21:01:42.852 ServerApp] nbclassic | extension was successfully loaded.
[I 2021-08-01 21:01:42.852 ServerApp] Serving notebooks from local directory: /home/username
[I 2021-08-01 21:01:42.853 ServerApp] Jupyter Server 1.4.1 is running at:
[I 2021-08-01 21:01:42.853 ServerApp] http://localhost:8888/lab?token=3d46a4259293e2afc5f584cf2d62586c5c553fd37e55e775
[I 2021-08-01 21:01:42.853 ServerApp] or http://127.0.0.1:8888/lab?token=3d46a4259293e2afc5f584cf2d62586c5c553fd37e55e775
[I 2021-08-01 21:01:42.853 ServerApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 2021-08-01 21:01:42.877 ServerApp]
To access the server,open this file in a browser:
file:///home/username/.local/share/jupyter/runtime/jpserver-9804-open.html
Or copy and paste one of these URLs:
http://localhost:8888/lab?token=3d46a4259293e2afc5f584cf2d62586c5c553fd37e55e775
or http://127.0.0.1:8888/lab?token=3d46a4259293e2afc5f584cf2d62586c5c553fd37e55e775
[I 2021-08-01 21:01:48.429 LabApp] Build is up to date
[W 2021-08-01 21:01:49.469 ServerApp] Notebook Desktop/Link to foldername/ms-p/peroo/anl.ipynb is not trusted
[I 2021-08-01 21:01:52.346 ServerApp] Kernel started: 7bbe2308-8b30-4a4b-8b04-31aabe33d635
Traceback (most recent call last):
File "/home/username/anaconda3/lib/python3.8/runpy.py",line 194,in _run_module_as_main
return _run_code(code,main_globals,None,File "/home/username/anaconda3/lib/python3.8/runpy.py",line 87,in _run_code
exec(code,run_globals)
File "/home/username/anaconda3/lib/python3.8/site-packages/ipykernel_launcher.py",line 15,in <module>
from ipykernel import kernelapp as app
File "/home/username/anaconda3/lib/python3.8/site-packages/ipykernel/__init__.py",line 2,in <module>
from .connect import *
File "/home/username/anaconda3/lib/python3.8/site-packages/ipykernel/connect.py",line 13,in <module>
from IPython.core.profiledir import ProfileDir
File "/home/username/anaconda3/lib/python3.8/site-packages/IPython/__init__.py",line 55,in <module>
from .core.application import Application
File "/home/username/anaconda3/lib/python3.8/site-packages/IPython/core/application.py",line 25,in <module>
from IPython.core import release,crashhandler
File "/home/username/anaconda3/lib/python3.8/site-packages/IPython/core/crashhandler.py",line 27,in <module>
from IPython.core import ultratb
File "/home/username/anaconda3/lib/python3.8/site-packages/IPython/core/ultratb.py",line 112,in <module>
from IPython.core import debugger
File "/home/username/anaconda3/lib/python3.8/site-packages/IPython/core/debugger.py",line 47,in <module>
from pdb import Pdb as OldPdb
File "/home/username/anaconda3/lib/python3.8/pdb.py",line 77,in <module>
import code
File "/home/username/Desktop/Projects/foldername/ms-p/peroo/code.py",line 535,in <module>
"execution_count": null,NameError: name 'null' is not defined
[I 2021-08-01 21:01:55.348 ServerApp] AsyncIOLoopKernelRestarter: restarting kernel (1/5),new random ports
Traceback (most recent call last):
File "/home/username/anaconda3/lib/python3.8/runpy.py",NameError: name 'null' is not defined
[I 2021-08-01 21:01:58.362 ServerApp] AsyncIOLoopKernelRestarter: restarting kernel (2/5),NameError: name 'null' is not defined