diff --git a/vars/default_vars.yml b/vars/default_vars.yml
index 06ebea839..1c87d0a67 100644
--- a/vars/default_vars.yml
+++ b/vars/default_vars.yml
@@ -402,17 +402,18 @@ vnstat_enabled: False
 # Calibre E-Book Library
 # WARNING: CALIBRE INSTALLS GRAPHICAL LIBRARIES SIMILAR TO X WINDOWS & OPENGL
 # ON (HEADLESS, SERVER, LITE) OS'S THAT DON'T ALREADY HAVE THESE INSTALLED.
-calibre_install: True
-calibre_enabled: True
+calibre_install: False
+calibre_enabled: False
 # vars/raspbian-9.yml tries the .deb upgrade of Calibre, overriding this default:
 calibre_via_debs: False
 calibre_unstable_debs: False
 # vars/<most-OS's>.yml use Calibre's python installer/upgrader (x86_64), overriding this default:
 calibre_via_python: False
-# Change calibre_port to 8010 if you're using XO laptops needing above idmgr
+# Change calibre_port to 8010 if you're using XO laptops needing above idmgr ?
 calibre_port: 8080
 # Change calibre to XYZ add your own mnemonic URL like: http://box/XYZ
 calibre_web_path: calibre  #NEEDS WORK: https://github.com/iiab/iiab/issues/529
+# Avoid collisions with calibreweb_url: below!
 
 # WARNING: Calibre-Web (below) depends on Calibre's own /usr/bin/ebook-convert
 # program, so we recommend you also install Calibre (above!)
diff --git a/vars/local_vars_big.yml b/vars/local_vars_big.yml
index ec2e751dd..7e7393b88 100644
--- a/vars/local_vars_big.yml
+++ b/vars/local_vars_big.yml
@@ -232,18 +232,13 @@ vnstat_enabled: True
 # Calibre E-Book Library
 # WARNING: CALIBRE INSTALLS GRAPHICAL LIBRARIES SIMILAR TO X WINDOWS & OPENGL
 # ON (HEADLESS, SERVER, LITE) OS'S THAT DON'T ALREADY HAVE THESE INSTALLED.
-calibre_install: True
-calibre_enabled: True
-# Try .deb upgrade of Calibre (like vars/raspbian-9.yml already does)
-# calibre_via_debs: True
-calibre_unstable_debs: False
-# Try python x86_64 upgrade of Calibre (like vars/<most-OS's>.yml already do)
-# calibre_via_python: True
-# Change calibre_port to 8010 if you're using XO laptops needing above idmgr
+calibre_install: False
+calibre_enabled: False
+# Change calibre_port to 8010 if you're using XO laptops needing above idmgr ?
 calibre_port: 8080
 # Change calibre to XYZ to add your own mnemonic URL like: http://box/XYZ
 calibre_web_path: calibre  #NEEDS WORK: https://github.com/iiab/iiab/issues/529
-# In addition to: http://box/books box/libros box/livres box/livros box/liv
+# Avoid collisions with calibreweb_url: below!
 
 # WARNING: Calibre-Web (below) depends on Calibre's own /usr/bin/ebook-convert
 # program, so we recommend you also install Calibre (above!)
diff --git a/vars/local_vars_medium.yml b/vars/local_vars_medium.yml
index 4cc70fd06..c69892b97 100644
--- a/vars/local_vars_medium.yml
+++ b/vars/local_vars_medium.yml
@@ -232,18 +232,13 @@ vnstat_enabled: True
 # Calibre E-Book Library
 # WARNING: CALIBRE INSTALLS GRAPHICAL LIBRARIES SIMILAR TO X WINDOWS & OPENGL
 # ON (HEADLESS, SERVER, LITE) OS'S THAT DON'T ALREADY HAVE THESE INSTALLED.
-calibre_install: True
-calibre_enabled: True
-# Try .deb upgrade of Calibre (like vars/raspbian-9.yml already does)
-# calibre_via_debs: True
-calibre_unstable_debs: False
-# Try python x86_64 upgrade of Calibre (like vars/<most-OS's>.yml already do)
-# calibre_via_python: True
-# Change calibre_port to 8010 if you're using XO laptops needing above idmgr
+calibre_install: False
+calibre_enabled: False
+# Change calibre_port to 8010 if you're using XO laptops needing above idmgr ?
 calibre_port: 8080
 # Change calibre to XYZ to add your own mnemonic URL like: http://box/XYZ
 calibre_web_path: calibre  #NEEDS WORK: https://github.com/iiab/iiab/issues/529
-# In addition to: http://box/books box/libros box/livres box/livros box/liv
+# Avoid collisions with calibreweb_url: below!
 
 # WARNING: Calibre-Web (below) depends on Calibre's own /usr/bin/ebook-convert
 # program, so we recommend you also install Calibre (above!)
diff --git a/vars/local_vars_min.yml b/vars/local_vars_min.yml
index b48d9a460..2e1028d4a 100644
--- a/vars/local_vars_min.yml
+++ b/vars/local_vars_min.yml
@@ -234,16 +234,11 @@ vnstat_enabled: True
 # ON (HEADLESS, SERVER, LITE) OS'S THAT DON'T ALREADY HAVE THESE INSTALLED.
 calibre_install: False
 calibre_enabled: False
-# Try .deb upgrade of Calibre (like vars/raspbian-9.yml already does)
-# calibre_via_debs: True
-calibre_unstable_debs: False
-# Try python x86_64 upgrade of Calibre (like vars/<most-OS's>.yml already do)
-# calibre_via_python: True
-# Change calibre_port to 8010 if you're using XO laptops needing above idmgr
+# Change calibre_port to 8010 if you're using XO laptops needing above idmgr ?
 calibre_port: 8080
 # Change calibre to XYZ to add your own mnemonic URL like: http://box/XYZ
 calibre_web_path: calibre  #NEEDS WORK: https://github.com/iiab/iiab/issues/529
-# In addition to: http://box/books box/libros box/livres box/livros box/liv
+# Avoid collisions with calibreweb_url: below!
 
 # WARNING: Calibre-Web (below) depends on Calibre's own /usr/bin/ebook-convert
 # program, so we recommend you also install Calibre (above!)