Apache Airflow : airflow initdb results in “ImportError: No module named json”

Question

On Ubuntu 16.04 with Python 2.7 default version, I am trying to install Apache airflow but ran into several issues and currently I see on

apache initdb 
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Answer 1

On Mac while installing apache-airflow, I got following error:

ERROR: apache-airflow 1.10.3 has requirement jinja2<=2.10.0,>=2.7.3, but you'll have jinja2 2.10.1 which is incompatible. ERROR: apache-airflow 1.10.3 has requirement werkzeug<0.15.0,>=0.14.1, but you'll have werkzeug 0.15.4 which is incompatible.

Re-installing werkzeug and jinja worked for me.

pip install jinja2>=2.10.0
pip install werkzeug>=0.15.0