If you’re trying out or moving to Linux Mint and you’re used to setting up FreeTDS on Ubuntu, you’ll find that things are just slightly different on Mint.

Quick and easy fix:
sudo apt-get install freetds-bin tdsodbc

Also note that libtdsodbc.so in a different place on Mint than on Ubuntu, so instead of it being located at /usr/local/lib/libtdsodbc.so it’ll be here:
/usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so