Can't open lib 'ODBC Driver 13 for SQL Server'? Sym linking issue?

Running:

odbcinst -j

It yielded:

unixODBC 2.3.4
DRIVERS............: /etc/odbcinst.ini
SYSTEM DATA SOURCES: /etc/odbc.ini
FILE DATA SOURCES..: /etc/ODBCDataSources
USER DATA SOURCES..: /Users/emehex/.odbc.ini
SQLULEN Size.......: 8
SQLLEN Size........: 8
SQLSETPOSIROW Size.: 8

Instead of copying the files to the /etc/ directory (not sure why unixODBC thought they were there) I created a symbolic link to each file:

sudo ln -s /usr/local/etc/odbcinst.ini /etc/odbcinst.ini
sudo ln -s /usr/local/etc/odbc.ini /etc/odbc.ini

This solved the problem.

In my case, I had to change the pyodbc database driver string to
driver='{ODBC Driver 17 for SQL Server}'

actually, in my python code pyodbc was expecting ODBC Driver 13 but, as the ODBC Driver version was updated (because of ubuntu update) to current version ODBC Driver 17, the problem had occurred.

In my case, I have a Mac OS and the following commands fixed the problem:

brew tap microsoft/mssql-release https://github.com/Microsoft/homebrew-mssql-release
brew update
brew install msodbcsql mssql-tools

Note 1: It might be necessary that you need to install unixodbc in advance to msodbcsql and mssql-tools as the following:

brew install unixodbc

Note 2: If you dont have already brew, the Missing Package Manager for macOS, then you can install it from here: https://brew.sh/

Note 3: You can verifiy your installation as @emehex already mentioned above with the following commands:

odbcinst -j

sudo ln -s /usr/local/etc/odbcinst.ini /etc/odbcinst.ini
sudo ln -s /usr/local/etc/odbc.ini /etc/odbc.ini