On Ansible Tower Nodes With Non-Default Locale Rather Than “en_US.UTF-8”, Why Ansible Tower Installation Failed With “Unable to restart service postgresql”?

Issue

setup.sh fails as below.

TASK [postgres : restart postgresql when authentication settings changed] ****************************************************************************************
fatal: [localhost]: FAILED! => {"changed": false, "msg": "Unable to restart service postgresql: Job for postgresql.service failed because the control process exited with error code.\nSee \"systemctl status postgresql.service\" and \"journalctl -xe\" for details.\n"}