diff --git a/roles/calibre/tasks/install.yml b/roles/calibre/tasks/install.yml
index 2982fe60e..ad72beade 100644
--- a/roles/calibre/tasks/install.yml
+++ b/roles/calibre/tasks/install.yml
@@ -7,9 +7,14 @@
       - calibre-bin
     state: latest
 
-- name: Install Calibre via .debs (if Raspbian)
-  command: scripts/calibre-install-latest-rpi.sh    # WORKED for Calibre 3.33.1 on 2018-10-23.  And Calibre 3.28 on 2018-07-26 (PR #971).  Likewise for Calibre 3.26.x.  FAILED with Calibre 3.24+ ("calibre : Depends: python-pyqt5 (>= 5.10.1+dfsg-2) but 5.10.1+dfsg-1+rpi1 is to be installed") since June 2018.
-  when: is_raspbian | bool
+# 2020-04-29: AT YOUR OWN RISK, this *sometimes* works, e.g. to upgrade from
+# Raspbian 10's Calibre 3.39.1 to "4.99.4+dfsg+really4.12.0-1" or higher, from:
+# http://raspbian.raspberrypi.org/raspbian/pool/main/c/calibre/
+# http://archive.raspbian.org/raspbian/pool/main/c/calibre/
+#
+#- name: Install Calibre via .debs (if Raspbian)
+#  command: scripts/calibre-install-latest-rpi.sh    # WORKED for Calibre 3.33.1 on 2018-10-23.  And Calibre 3.28 on 2018-07-26 (PR #971).  Likewise for Calibre 3.26.x.  FAILED with Calibre 3.24+ ("calibre : Depends: python-pyqt5 (>= 5.10.1+dfsg-2) but 5.10.1+dfsg-1+rpi1 is to be installed") since June 2018.
+#  when: is_raspbian | bool
 
 # 2020-04-29: Can work *IF* you do 'apt install python2' and change top line
 # of /opt/iiab/downloads/calibre-installer.py from '#!/usr/bin/env python2'
@@ -17,7 +22,7 @@
 #
 #- name: Install Calibre via py-installer.yml -> calibre-installer.py (if not Raspbian)
 #  include_tasks: py-installer.yml
-#  when: not is_raspbian
+#  when: not is_raspbian    # True Debian or any Ubuntu?
 
 # SEE calibre_via_python's value vars/default_vars.yml, vars/ubuntu-18.yml &
 # vars/raspbian-9.yml: try to AVOID Python installer on Raspbian since its