diff --git a/roles/moodle/tasks/install.yml b/roles/moodle/tasks/install.yml
index 0d1e39663..e421c2e21 100644
--- a/roles/moodle/tasks/install.yml
+++ b/roles/moodle/tasks/install.yml
@@ -33,9 +33,8 @@
       - php{{ php_version }}-curl
       - php{{ php_version }}-zip
       - php{{ php_version }}-gd
-      #- php{{ php_version }}-mbstring
-      # 2020-06-15: Above (phpX.Y-mbstring) is now required by Moodle 3.9+ ...and (apparently) included by phpX.Y-cli below:
-      - php{{ php_version }}-cli
+      - php{{ php_version }}-mbstring    # 2020-06-15: Now required by Moodle 3.9+
+      - php{{ php_version }}-cli    # 2020-06-15: In the past this included (above) mbstring? However this is not true on Ubuntu Server 20.04 LTS.
     state: present
   when: is_debuntu | bool