It’s hard to install psycopg2 on a Linux server that running python 3.
First of all, you need to install python3-dev. The python3-dev package is required for compilation of Python 3 extensions written in C or C++, like psycopg2. If you’re running a Debian-based distribution (e.g. Ubuntu, linux mint), you can install python3-dev by running:
apt-get install python3-dev
Then you can install psycopg2 normally (here is example with a python package manager):
pip install psycopg2
If you’re using python2, you should install python-dev instead
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