Notebook: Dead kernel with python virtual environment

[whitecoffee]

I work with ubuntu 16.04 which contains python 3.5 & python 2.7 naturally.
Inside the python package I create a virtual environment (named env) and install the jupyter in my env.
But I got dead kernel (the kernel named python3) in browser.

I type the which python3 and got /home/my_name/package_name/env/bin/python3
ANYONE has an idea to fix it???

[takluyver]

When this happens, is there any error message in the terminal where you launched the notebook?

[whitecoffee]

All right, I fix it with code ipython kernel install --user
Thanks for your attention @takluyver