I have been trying install 15.12.1 on an ubuntu 14 EC2 instance, and have not been able to get as far as
$ deployment/deploy.sh prepare_postgresql ....
As I have not found a way disable all forms of authentication for root access via ssh as your installation scripts appear to require.
I have tried including removing root password from /etc/shadow, and updating ssh_config to PermitRootLogin without-password and PermitEmptyPasswords, but for some reason su and ssh as root still require passwords and your deployment scripts fail.
Even if I were able to get past this first step, I am struggling to understand why scidb requires us to compromise system security so dramatically for something as basic as installing postgres.