Some specific characters cannot be used for superuser password during the installation. I've checked with the version 9.2.24 and 10.3.
The characters which are found so far are the followings: - " - < - >
The installer doesn't show any error messages about it when to setup the superuser password but it fails to start the server at the last of installation process, which message says it fails to read postgresql.conf. The database cluster has never been created.
now, I need to setup the password without those characters and then change it later..
I think it should be able to use those characters, or show a message and give a second chance at least.