some fixes for debian 10

roles/common/tasks/postgres.yml

     - python-psycopg2
   tags:
     - dependencies
+  when: ansible_distribution_version == '9'
+
+- name: Install Postgres
+  apt:
+    name: "{{ packages }}"
+    state: present
+  vars:
+    packages:
+    - postgresql
+    - python-psycopg2
+  tags:
+    - dependencies
+  when: ansible_distribution_version == '10'
 
 - name: Set password for PostgreSQL admin user
   become: true

roles/common/tasks/security.yml

 
 - name: add stretch-backport for fail2ban with IPv6 support
   apt_repository: repo='deb http://deb.debian.org/debian stretch-backports main' state=present update_cache=yes
+  tags:
+    - dependencies
+  when: ansible_distribution_version == '9'
 
 - name: Install newer fail2ban with IPv6 support
   apt:
     default_release: stretch-backports
   tags:
     - dependencies
+  when: ansible_distribution_version == '9'
+
+- name: Install fail2ban
+  apt:
+    name: "fail2ban"
+    state: present
+  tags:
+    - dependencies
+  when: ansible_distribution_version == '10'
 
 - name: Copy fail2ban configuration into place
   template: src=etc_fail2ban_jail.local.j2 dest=/etc/fail2ban/jail.local