在jupyter官网推荐的下载方式有
1.conda
If you use conda, you can install it with:
$ conda install-cconda-forge jupyterlab
2.pip
If you use pip, you can install it with:
$ pip install jupyterlab
If installing using pip install --user, you must add the user-level bin directory to your PATH environment variable in order to launch jupyter lab.
使用conda命令下载jupyter时一直在Solving environment卡死
解决方法：
$ conda upgrade --all #先升级conda
$ conda install -c conda-forge jupyterlab #升级完成后再次下载
下载完成后输入
$jupyter notebook
