I had the same issue. There is another solution for postgres. Install postgresql-common first. Edit /etc/postresql-common/createcluster.conf to disable creatio

I had the same issue. There is another solution for postgres. Install postgresql-common first. Edit /etc/postresql-common/createcluster.conf to disable creation of the cluster on install (or change the options used to create the cluster) and then install postgresql-x.y