一样的问题 Conda environments not showing up in Jupyter Notebook
Conda environments not showing up in Jupyter Notebook
如果不使用nb_conda的解决说明：
I don’t think the other answers are working any more, as conda stopped automatically setting environments up as jupyter kernels. You need to manually add kernels for each environment in the following way:

source activate myenv
pip install ipykernel
python -m ipykernel install --user --name myenv --display-name "myenv"

rm jupyter_notebook_config.json in ~/.jupyter

或

jupyter serverextension disable nb_conda
jupyter serverextension enable nb_conda

报错jupyter cannot find my conda env
You need to install nb_conda, however, at the moment nb-conda cannot be directly installed with python3.6.
A way around that is to install it from conda-forge:

conda install -c conda-forge nb_conda

一旦配置之后，但是又配置错误了，彻底删除jupyter以及所有配置

jupyter kernelspec list 

列出所有可用的内核规范，注意这里只是看起来可以用，不代表真的就可以用，将其全部删掉。

jupyter --paths

输出 Jupyter 在系统中查找各种文件（包括配置文件）的路径信息。输出结果通常包括config（配置文件路径）、data（数据文件路径）和runtime（运行时文件路径）等部分。将其所有目录全面删掉。

可以的话，把这个环境变量也删了
conda remove --name myenv --all
重新建立一个
conda create -n myenv python=3.xx