Read other questions; unfortunately they were not relevant.
Using this tutorial: http://lpsolve.sourceforge.net/5.5/Python.htm
Found this file: lp_solve_5.5.2.0_exe_ux32
That contains these files:
The tutorial says the need file is: lpsolve55.so
How do you get lpsolve working with Python in Ubuntu?
You will need this file:
lp_solve_5.5.2.0_Python2.5_exe_ux64.tar.gz
Inside it you will find: liblpsolve55.so
You need to put that file in a place accessible to the python path. Had problems doing that so it's in the project's folder.
You also need this file:
lp_solve_5.5.2.0_dev_ux64.tar.gz
Inside it you will find:
liblpsolve55.so
This file needs to go to /lib/usr