diff --git a/roles/2-common/tasks/packages.yml b/roles/2-common/tasks/packages.yml
index 2b8f32d55..81bc35c94 100644
--- a/roles/2-common/tasks/packages.yml
+++ b/roles/2-common/tasks/packages.yml
@@ -30,6 +30,8 @@
       #- openssh-server    # ssh (Raspbian) or openssh-server (other OS's) already installed by 1-prep's roles/sshd/tasks/main.yml
       - pandoc             # For /usr/bin/iiab-refresh-wiki-docs
       - pastebinit         # For /usr/bin/iiab-diagnostics
+      #- python3-pip       # 2021-07-29: Already installed by /opt/iiab/iiab/scripts/ansible -- this auto-installs 'python3-setuptools' and 'python3' etc
+      #- python3-venv      # 2021-07-30: For Ansible module 'pip' used in roles like {calibre-web, jupyterhub, lokole} -- whereas roles/kalite uses (virtual) package 'virtualenv' for Python 2 -- all these 3+1 IIAB roles install 'python3-venv' for themselves.  FYI: Debian 11 auto-installs 'python3-venv' when you install 'python3' -- whereas Ubuntu (e.g. 20.04 & 21.10) and RaspiOS 10 do not.
       - rsync
       #- screen            # Installed by 1-prep's roles/iiab-admin/tasks/access.yml
       - sqlite3
diff --git a/roles/calibre-web/tasks/install.yml b/roles/calibre-web/tasks/install.yml
index 7fc422397..0e8a88122 100644
--- a/roles/calibre-web/tasks/install.yml
+++ b/roles/calibre-web/tasks/install.yml
@@ -1,4 +1,4 @@
-- name: "Install ImageMagick package: imagemagick"
+- name: "Install packages: imagemagick, python3-venv"
   package:
     name:
       - imagemagick
diff --git a/roles/jupyterhub/tasks/install.yml b/roles/jupyterhub/tasks/install.yml
index f33d05191..1f71ba454 100644
--- a/roles/jupyterhub/tasks/install.yml
+++ b/roles/jupyterhub/tasks/install.yml
@@ -13,6 +13,11 @@
   when: nodejs_installed is undefined
 
 
+- name: "Install package: python3-venv"
+  package:
+    name: python3-venv
+    state: present
+
 - name: Make 3 directories to hold JupyterHub config
   file:
     state: directory
@@ -40,8 +45,8 @@
       - jupyterhub-systemdspawner
     virtualenv: "{{ jupyterhub_venv }}"    # /opt/iiab/jupyterhub
     virtualenv_site_packages: no
-    virtualenv_command: /usr/bin/virtualenv
-    virtualenv_python: python3
+    virtualenv_command: python3 -m venv "{{ jupyterhub_venv }}"    # 2021-07-29: This works on RaspiOS 10, Debian 11, Ubuntu 20.04 and Mint 20 -- however if you absolutely must use the older Debian 10 -- you can work around errors "can't find Rust compiler" and "This package requires Rust >=1.41.0" if you (1) revert this line to 'virtualenv_command: virtualenv' AND (2) uncomment the line just below
+    #virtualenv_python: python3    # 2021-07-29: Was needed when above line was 'virtualenv_command: virtualenv' (generally for Python 2)
     extra_args: "--no-cache-dir"
   when: internet_available
 
diff --git a/roles/kalite/tasks/install.yml b/roles/kalite/tasks/install.yml
index ab6a923a8..390ea2719 100644
--- a/roles/kalite/tasks/install.yml
+++ b/roles/kalite/tasks/install.yml
@@ -11,13 +11,14 @@
 #  ignore_errors: yes
 #  when: is_raspbian
 
-- name: Install python2, if Raspbian/Debian > 10 or Ubuntu > 19
+- name: 'Install packages: python2, python-setuptools, virtualenv (for Python 2)'
   package:
     name:
       - python2
-      - python-setuptools # provides setuptools-44 last version compatible with python2
+      - python-setuptools    # Provides setuptools-44 on recent OS's (last version compatible with python2)
+      - virtualenv           # For Ansible module 'pip' when used with 'virtualenv_command: /usr/bin/virtualenv' and 'virtualenv_python: python2.7' -- compare package 'python3-venv' used by roles {calibre-web, jupyterhub, lokole}
     state: present
-  when: not (is_debian_9 or is_debian_10 or is_ubuntu_16 or is_ubuntu_17 or is_ubuntu_18 or is_ubuntu_19)
+  #when: not (is_debian_9 or is_debian_10 or is_ubuntu_16 or is_ubuntu_17 or is_ubuntu_18 or is_ubuntu_19)
   # 2020-03-31: Testing for {is_raspbian_9, is_raspbian_10} is not currently nec, as testing for {is_debian_9, is_debian_10} covers that already.
 
 - name: Use pip to pin setuptools to 44 in {{ kalite_venv }} if Raspbian/Debian > 10 or Ubuntu > 19
diff --git a/roles/munin/tasks/install.yml b/roles/munin/tasks/install.yml
index 0e7af8fe4..7d439ff5a 100644
--- a/roles/munin/tasks/install.yml
+++ b/roles/munin/tasks/install.yml
@@ -1,11 +1,12 @@
-- name: "Install 4 packages: munin, munin-node, munin-plugins-extra, libcgi-fast-perl"
+- name: "Install 5 packages: libcgi-fast-perl, munin, munin-node, munin-plugins-extra, python3-passlib"
   package:
     name:
+      #- libapache2-mod-fcgid
+      - libcgi-fast-perl
       - munin
       - munin-node
       - munin-plugins-extra
-      - libcgi-fast-perl
-      #- libapache2-mod-fcgid
+      - python3-passlib    # For Ansible module 'htpasswd' in Ansible collection community.general -- used just below
     state: present
 
 - name: Establish username/password Admin/changeme in /etc/munin/munin-htpasswd
diff --git a/roles/mysql/tasks/install.yml b/roles/mysql/tasks/install.yml
index 0dc338bd3..6788c4e9e 100644
--- a/roles/mysql/tasks/install.yml
+++ b/roles/mysql/tasks/install.yml
@@ -12,6 +12,7 @@
       - mariadb-client
       #- php{{ php_version }}-common    # Auto-installed as an apt dependency.  REGARDLESS: php{{ php_version }}-common superset php{{ php_version }}-cli is auto-installed by php{{ php_version }}-fpm in nginx/tasks/install.yml
       - php{{ php_version }}-mysql      # Likewise installed in nextcloud/tasks/install.yml, pbx/tasks/freepbx_dependencies.yml, wordpress/tasks/install.yml
+      - python3-pymysql                 # For Ansible modules {mysql_db, mysql_user} in Ansible collection community.mysql -- used in MySQL roles {mediawiki, nextcloud, wordpress} and possibly {elgg, pbx}
     state: present
 
 # 2020-07-11:
diff --git a/roles/postgresql/tasks/install.yml b/roles/postgresql/tasks/install.yml
index bc180c234..3fa1a95d0 100644
--- a/roles/postgresql/tasks/install.yml
+++ b/roles/postgresql/tasks/install.yml
@@ -3,6 +3,7 @@
     name:
       - postgresql
       - postgresql-client
+      - python3-psycopg2    # For Ansible modules {postgresql_db, postgresql_user} in Ansible collection community.postgresql -- used in moodle/tasks/install.yml
     state: present
 
 - name: Install /etc/systemd/system/postgresql-iiab.service from template (0644 by default)
diff --git a/scripts/ansible b/scripts/ansible
index b76c888ed..bd14bc7b5 100755
--- a/scripts/ansible
+++ b/scripts/ansible
@@ -4,7 +4,6 @@
 # https://stackoverflow.com/questions/9952177/whats-the-meaning-of-the-parameter-e-for-bash-shell-command-line/9952249
 
 # PLZ SEE http://FAQ.IIAB.IO > "What is Ansible and what version should I use?"
-#         https://github.com/iiab/iiab/tree/master/scripts/ansible.md
 #         https://github.com/iiab/iiab/wiki/IIAB-Contributors-Guide#ansible
 
 APT_PATH=/usr/bin     # Avoids problematic /usr/local/bin/apt on Linux Mint
@@ -149,13 +148,24 @@ fi
 ###echo -e 'ENSURE ANSIBLE UPDATES CLEANLY: (then re-run this script to be sure!)\n'
 ###grep '^deb .*ansible' /etc/apt/sources.list /etc/apt/sources.list.d/*.list | grep -v '^/etc/apt/sources.list.d/iiab-ansible.list:' || true    # Override bash -e (instead of aborting at 1st error)
 
-echo -e "\napt update; apt install of python3-* / virtualenv packages explained at:"
-echo -e "https://github.com/iiab/iiab/blob/master/scripts/ansible.md\n"
+echo -e "\napt update; apt install python3-pip    # Also installs 'python3-setuptools' and 'python3' etc"
+#echo -e "https://github.com/iiab/iiab/blob/master/scripts/ansible.md\n"
 $APT_PATH/apt update
+$APT_PATH/apt -y install python3-pip
+
+# 2021-07-29:
+# 'python3-packaging' dropped for now
+# 'python3-pymysql' (drags in 'python3' which drags in 'python3-venv' on Debian 11 but not on Ubuntu 20.04) -- moved to roles/mysql/tasks/install.yml
+# 'python3-psycopg2' moved to roles/postgresql/tasks/install.yml
+# 'python3-passlib' moved to roles/munin/tasks/install.yml
+# 'python3-venv' moved to roles/2-common/tasks/packages.yml
+# 'virtualenv' for Python 2 moved to roles/kalite/tasks/install.yml
+#
+#$APT_PATH/apt -y install \
+#              python3-pymysql python3-psycopg2 python3-passlib python3-pip \
+#              python3-setuptools python3-packaging python3-venv virtualenv
+
 #$APT_PATH/apt -y --allow-downgrades install ansible-core \
-$APT_PATH/apt -y install \
-              python3-pymysql python3-psycopg2 python3-passlib python3-pip \
-              python3-setuptools python3-packaging python3-venv virtualenv
 
 echo -e "\n\n'pip3 install --upgrade ansible-core' will now run:\n"
 pip3 install --upgrade ansible-core
diff --git a/scripts/ansible.md b/scripts/ansible.md.unused
similarity index 100%
rename from scripts/ansible.md
rename to scripts/ansible.md.unused