OK, back to packaging and dependency problems. 
@SwartzCr @bmw?
By the way, there is a previous thread involving @Rafaelhgb's original attempts to obtain and install this certificate
but I don't think it provides any insight, because at that time the command
sudo ./certbot-auto --debug -v --server https://acme-v01.api.letsencrypt.org/directory certonly -d mercadocaseiro.com
ultimately did work fine without any dependency errors (the problems that Rafael encountered then were different and seemingly not related to the current problem).