diff --git a/defaults/main.yml b/defaults/main.yml
new file mode 100644
index 0000000..f278320
--- /dev/null
+++ b/defaults/main.yml
@@ -0,0 +1,3 @@
+---
+debug: false
+state: present # possible values defined in meta/argument_specs.yml
diff --git a/meta/argument_specs.yml b/meta/argument_specs.yml
index 1427f32..213c565 100644
--- a/meta/argument_specs.yml
+++ b/meta/argument_specs.yml
@@ -6,6 +6,41 @@ argument_specs:
       - The main entry point just combines the repositories and packages
              entry points.
     options:
+      debug:
+        description: Use debug module to display 'pro' command stdout/stderr
+        type: bool
+        default: false
+      disabled_services:
+        description: List of services to disable
+        type: list
+        elements: str
+        choices:
+          - 'cc-eal'       # Common Criteria EAL2
+          - 'esm-infra'    # Expanded Security Maintenance for Infrastructure
+          - 'fips'
+          - 'fips-updates'
+          - 'livepatch'    # Canonical Kernel Livepatch
+          - 'usg'
+      enabled_services:
+        description: List of services to enable
+        type: list
+        elements: str
+        choices:
+          - 'cc-eal'       # Common Criteria EAL2
+          - 'esm-infra'    # Expanded Security Maintenance for Infrastructure
+          - 'fips'
+          - 'fips-updates'
+          - 'livepatch'    # Canonical Kernel Livepatch
+          - 'usg' 
+      state:
+        description: State of Ubuntu Pro installation
+        type: str
+        choices:
+          - absent
+          - attached
+          - detached
+          - present
+        default: present
       ubuntu_pro_token:
         description:
           - Ubuntu Pro token
@@ -18,7 +53,7 @@ argument_specs:
         required: false
       ubuntu_pro_config.https_proxy:
         description:
-          - HTTPW Proxy
+          - HTTPS Proxy
         type: str
         required: false
       ubuntu_pro_config.apt_http_proxy:
@@ -28,7 +63,7 @@ argument_specs:
         required: false
       ubuntu_pro_config.apt_https_proxy:
         description:
-          - apt HTTPs Proxy
+          - apt HTTPS Proxy
         type: str
         required: false
       ubuntu_pro_config.ua_apt_http_proxy:
diff --git a/tasks/main.yml b/tasks/main.yml
index 2d96dec..2b0b29e 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -1,20 +1,32 @@
 ---
 - name: Include tasks 'validate_ubuntu_lts_version.yml'
   include_tasks: validate_ubuntu_lts_version.yml
+  when: state == 'present' or state == 'attached'
 
-# - name: Include tasks 'requirements.yml'
-#   include_tasks: requirements.yml
+- name: Include tasks 'requirements.yml'
+  include_tasks: requirements.yml
+  when: state == 'present' or state == 'attached'
 
 - name: Include tasks 'configure.yml'
   include_tasks: configure.yml
+  when: state == 'present' or state == 'attached'
 
 - name: Include tasks 'register.yml'
   include_tasks: register.yml
+  when: state == 'present' or state == 'attached'
 
 - name: Include tasks 'enable_services.yml'
   include_tasks: enable_services.yml
-  when: enabled_services is defined
+  when: enabled_services is defined and (state == 'present' or state == 'attached')
 
 - name: Include tasks 'disable_services.yml'
   include_tasks: disable_services.yml
-  when: disabled_services is defined
+  when: disabled_services is defined and (state == 'present' or state == 'attached')
+
+- name: Include tasks 'unregister.yml'
+  include_tasks: unregister.yml
+  when: state == 'absent' or state == 'detached'
+
+- name: Include tasks 'uninstall.yml'
+  include_tasks: uninstall.yml
+  when: state == 'absent'
diff --git a/tasks/register.yml b/tasks/register.yml
index 6f71165..20f5869 100644
--- a/tasks/register.yml
+++ b/tasks/register.yml
@@ -3,8 +3,10 @@
   ansible.builtin.command: "pro attach {{ ubuntu_pro_token }}"
   become: yes
   register: reg_pro_attach
+  changed_when: reg_pro_attach.rc == 0
   failed_when: (reg_pro_attach.rc != 0) and ('This machine is already attached to' not in reg_pro_attach.stderr_lines[0])
 
 - name: Print 'pro attach' command output
   ansible.builtin.debug:
     var: reg_pro_attach
+  when: debug
diff --git a/tasks/requirements.yml b/tasks/requirements.yml
index bb5b2ed..2b69265 100644
--- a/tasks/requirements.yml
+++ b/tasks/requirements.yml
@@ -1,13 +1,13 @@
 ---
-- name: Launch 'apt update'
-  ansible.builtin.apt:
-    update_cache: yes
-  become: yes
+# - name: Launch 'apt update'
+#   ansible.builtin.apt:
+#     update_cache: yes
+#   become: yes
 
-- name: Launch 'apt upgrade'
-  ansible.builtin.apt:
-    upgrade: yes
-  become: yes
+# - name: Launch 'apt upgrade'
+#   ansible.builtin.apt:
+#     upgrade: yes
+#   become: yes
 
 - name: Install 'ubuntu-advantage-tools' package
   ansible.builtin.apt:
diff --git a/tasks/uninstall.yml b/tasks/uninstall.yml
new file mode 100644
index 0000000..da6e11e
--- /dev/null
+++ b/tasks/uninstall.yml
@@ -0,0 +1,6 @@
+---
+- name: Uninstall 'ubuntu-advantage-tools' package
+  ansible.builtin.apt:
+    name: ubuntu-advantage-tools
+    state: absent
+  become: yes
diff --git a/tasks/unregister.yml b/tasks/unregister.yml
new file mode 100644
index 0000000..6027e28
--- /dev/null
+++ b/tasks/unregister.yml
@@ -0,0 +1,20 @@
+---
+- ansible.builtin.shell: "command pro"
+  register: reg_command_pro
+  ignore_errors: yes
+
+- set_fact:
+    pro_command_exists: "{{ (reg_command_pro.rc == 127) | ternary(false, true) }}"
+
+- name: Unregister this host on Ubuntu Pro (pro detach)
+  ansible.builtin.command: "pro detach --assume-yes"
+  become: yes
+  register: reg_pro_detach
+  changed_when: reg_pro_detach.rc == 0
+  failed_when: (reg_pro_detach.rc != 0) and ('This machine is not attached to an Ubuntu Pro subscription.' not in reg_pro_detach.stderr_lines[0])
+  when: pro_command_exists
+
+- name: Print 'pro detach' command output
+  ansible.builtin.debug:
+    var: reg_pro_detach
+  when: (debug and pro_command_exists)