The sensorflow does not start on the jupyter notebook.

About the first half of the question

Python imports modules by looking for names in the built-in module, then by listing the directories in sys.path.

Simply import does not invoke a package in a different environment, which results in an error.If you really want to invoke it, you can import tensorflow by adding a directory with the tensorflow package to sys.path as follows:

import sys
sys.path.append('pathto/site-packages')

I'm curious about the sentence below, but have you created a file called tensorflow.py or a directory called tensorflow in a directory where you can search for it, such as the current directory?If you have, import tensorflow will import that file or directory, and the original tensorflow package will not load.

Import succeeds on jupyter notebook, but

The path of the imported module can be displayed using the following command, so you should check it.

print(tensorflow.__path__)    

About the second half of the question

If you follow the documentation in the question, you are configured to use the installed module as follows:

virtualenv --system-site-packages-python3

However, with Ubuntu 18.04, this will cause the same problem as the one mentioned in the question.GitHub pip also has a problem.Ubuntu 17.10 appears to be experiencing the same problem.

In order to eliminate this error first, you can configure the virtual environment without the installed modules.

virtualenv-p python3