diff --git a/vars/default_vars.yml b/vars/default_vars.yml
index 2c6a94a62..acdb2be74 100644
--- a/vars/default_vars.yml
+++ b/vars/default_vars.yml
@@ -240,6 +240,11 @@ idmgr_enables: False
 
 calibre_install: True
 calibre_enabled: True
+# Try to force installation of a later Calibre (SEE vars/raspbian-9.yml)
+calibre_via_debs: False
+calibre_unstable_debs: False
+# Try to force installation of latest x86_64 Calibre (SEE vars/ubuntu-18.yml)
+calibre_via_python: False
 # 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