I am getting an "Internal Server Error" when trying to install Odoo 12 Community Edition on an AWS EC2 instance using a docker-compose file. My EC2 instance uses Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-1031-aws x86_64) operating system, Docker version 18.09.0 and docker-compose version 1.23.2. 

Here is my docker-compose.yml file:

version: '2'
services:
  web:
    image: odoo:12.0
    depends_on:
      - db
    ports:
      - "8069:8069"
    volumes:
      - odoo-web-data:/var/lib/odoo
      - ./config:/etc/odoo
      - ./addons:/mnt/extra-addons
  db:
    image: postgres:10
    environment:
      - POSTGRES_PASSWORD=odoo
      - POSTGRES_USER=odoo
      - PGDATA=/var/lib/postgresql/data/pgdata
    volumes:
      - odoo-db-data:/var/lib/postgresql/data/pgdata
volumes:
  odoo-web-data:
  odoo-db-data:

I can see the containers being created as is evidenced by the following output of the "docker ps -a" command:

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                              NAMES

64e271db9565        odoo:12.0           "/entrypoint.sh odoo"    2 hours ago         Up 2 hours          0.0.0.0:8069->8069/tcp, 8071/tcp   ubuntu_web_1

10b3198e3230        postgres:10         "docker-entrypoint.s…"   2 hours ago         Up 2 hours          5432/tcp                           ubuntu_db_1