Hello, again, Bogna! I agree with Rogan Hamby's suggestion of trying Koha.
It is big, too, but not quite as big as Evergreen and I hear it is easier to install. It may fit your needs better. You can find Koha here: https://koha-community.org/ Also, I think Ben Shum is correct, you'll want to use the latest releases of OpenSRF and Evergreen for Ubuntu 16.04. We tend to lag a bit behind the Ubuntu release cycle. Good luck in your search! Jason