deb http://debs.pelotas.ifsul.edu.br/debian buster contrib main non-free
deb http://debs.pelotas.ifsul.edu.br/debian buster-backports contrib main non-free
deb http://debs.pelotas.ifsul.edu.br/debian buster-proposed-updates contrib main non-free
deb http://debs.pelotas.ifsul.edu.br/debian buster-updates contrib main non-free