diff --git a/roles/6-generic-apps/tasks/main.yml b/roles/6-generic-apps/tasks/main.yml
index f43e878f3..648991a4f 100644
--- a/roles/6-generic-apps/tasks/main.yml
+++ b/roles/6-generic-apps/tasks/main.yml
@@ -29,7 +29,7 @@
 - name: JUPYTERHUB
   include_role:
     name: jupyterhub
-  when: jupyterhub_install
+  when: jupyterhub_install and ansible_machine is search("64")    # 2022-11-10: Avoid installing on 32-bit, until RasPiOS fixes Rust (PR #3421)
 
 # UNMAINTAINED
 - name: LOKOLE
diff --git a/roles/9-local-addons/tasks/main.yml b/roles/9-local-addons/tasks/main.yml
index f9ea8e20f..e8ab5d14b 100644
--- a/roles/9-local-addons/tasks/main.yml
+++ b/roles/9-local-addons/tasks/main.yml
@@ -27,7 +27,7 @@
 - name: CALIBRE-WEB
   include_role:
     name: calibre-web
-  when: calibreweb_install
+  when: calibreweb_install and ansible_machine is search("64")    # 2022-11-10: Avoid installing on 32-bit, until RasPiOS fixes Rust (PR #3421)
 
 # KEEP NEAR THE VERY END as this installs dependencies from Debian's 'testing' branch!
 - name: CALIBRE