jupyter重启失败KernelRestarter: restart failed

在jupyter启动时候发现出现了如下错误：

[W 11:33:41.703 NotebookApp] KernelRestarter: restart failed
[W 11:33:41.703 NotebookApp] Kernel cbc82194-2371-4227-87cf-859364cc09d4 died, removing from map.
[W 11:34:26.889 NotebookApp] Timeout waiting for kernel_info reply from cbc82194-2371-4227-87cf-859364cc09d4
[E 11:34:26.892 NotebookApp] Error opening stream: HTTP 404: Not Found (Kernel does not exist: cbc82194-2371-4227-87cf-859364cc09d4)
[W 11:34:28.140 NotebookApp] 404 GET /api/kernels/cbc82194-2371-4227-87cf-859364cc09d4/channels?session_id=9614948d3c004c2b8060d1f5e165db71 (36.102.210.157): Kernel does not exist: cbc82194-2371-4227-87cf-859364cc09d4

浏览器中打开后发现：未能连接成功

解决方案：

pip install --upgrade ipykerne

发现继续报错：

(jiqistudy) root@iZ2zeemzp51mlbzarwptwwZ:~/algorithm# pip install --upgrade ipykernel
Looking in indexes: http://mirrors.cloud.aliyuncs.com/pypi/simple/
Requirement already up-to-date: ipykernel in /root/.virtualenvs/jiqistudy/lib/python3.5/site-packages (5.2.1)
Requirement already satisfied, skipping upgrade: jupyter-client in /root/.virtualenvs/jiqistudy/lib/python3.5/site-packages (from ipykernel) (6.1.3)
Requirement already satisfied, skipping upgrade: ipython>=5.0.0 in /root/.virtualenvs/jiqistudy/lib/python3.5/site-packages (from ipykernel) (7.14.0)
ERROR: Package 'ipython' requires a different Python: 3.5.2 not in '>=3.6'

ERROR: Package 'ipython' requires a different Python: 3.5.2 not in '>=3.6'

查看包的版本：

pip list

卸载ipython包，重新安装ipython

pip ubinstall ipython #卸载之前的ipython包
pip install ipython #重新安装ipython包，ubuntu会自动识别应该安装的包的版本

退出虚拟环境，重新进入文件目录，重启jupter

deactivate
(jiqistudy) root@iZ2zeemzp51mlbzarwptwwZ:~/algorithm# jupyter notebook --allow-root

重启服务，连接成功！