How to install psycopg2 in django virtualdev on Ubuntu 18.04?

Question

Django

The psycopg2 package is needed to install heroku

in the console

spoiler

(my-venv) [email protected]:~/Home/ASITES/python/12v$ pip install psycopg2
Collecting psycopg2
  Using cached psycopg2-2.8.5.tar.gz (380 kB)
    ERROR: Command errored out with exit status 1:
     command: /home/user/Home/ASITES/python/12v/my-venv/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-786b0yov/psycopg2/setup.py'"'"'; __file__='"'"'/tmp/pip-install-786b0yov/psycopg2/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-install-786b0yov/psycopg2/pip-egg-info
         cwd: /tmp/pip-install-786b0yov/psycopg2/
    Complete output (23 lines):
    running egg_info
    creating /tmp/pip-install-786b0yov/psycopg2/pip-egg-info/psycopg2.egg-info
    writing /tmp/pip-install-786b0yov/psycopg2/pip-egg-info/psycopg2.egg-info/PKG-INFO
    writing dependency_links to /tmp/pip-install-786b0yov/psycopg2/pip-egg-info/psycopg2.egg-info/dependency_links.txt
    writing top-level names to /tmp/pip-install-786b0yov/psycopg2/pip-egg-info/psycopg2.egg-info/top_level.txt
    writing manifest file '/tmp/pip-install-786b0yov/psycopg2/pip-egg-info/psycopg2.egg-info/SOURCES.txt'
    
    Error: pg_config executable not found.
    
    pg_config is required to build psycopg2 from source.  Please add the directory
    containing pg_config to the $PATH or specify the full executable path with the
    option:
    
        python setup.py build_ext --pg-config /path/to/pg_config build ...
    
    or with the pg_config option in 'setup.cfg'.
    
    If you prefer to avoid building psycopg2 from source, please install the PyPI
    'psycopg2-binary' package instead.
    
    For further information please check the 'doc/src/install.rst' file (also at
    <https://www.psycopg.org/docs/install.html>).
    
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
WARNING: You are using pip version 20.0.2; however, version 20.1.1 is available.
You should consider upgrading via the '/home/user/Home/ASITES/python/12v/my-venv/bin/python -m pip install --upgrade pip' command.

What command and how to register the correct path?