diff --git a/roles/7-edu-apps/tasks/main.yml b/roles/7-edu-apps/tasks/main.yml
index c5f15e117..570c4b3d1 100644
--- a/roles/7-edu-apps/tasks/main.yml
+++ b/roles/7-edu-apps/tasks/main.yml
@@ -6,7 +6,7 @@
 - name: KALITE
   include_role:
     name: kalite
-  when: kalite_install
+  when: kalite_install and (is_ubuntu_2204 or is_ubuntu_2310 or is_debian_12)    # Also covers is_linuxmint_21 and is_raspbian_12
 
 - name: KOLIBRI
   include_role:
diff --git a/roles/kalite/tasks/install.yml b/roles/kalite/tasks/install.yml
index d2c2da478..5738c7301 100644
--- a/roles/kalite/tasks/install.yml
+++ b/roles/kalite/tasks/install.yml
@@ -49,6 +49,9 @@
     extra_args: "--no-cache-dir"
   when: is_ubuntu_2204 or is_ubuntu_2310 or is_debian_12    # Also covers is_linuxmint_21 and is_raspbian_12
 
+# 2024-04-30: Sadly no longer works with Ubuntu 24.04 LTS final release (#3731).
+# So roles/kalite is OS-restricted during initial install, SEE: roles/7-edu-apps/tasks/main.yml
+# CLARIF: If install_python2_kalite-venv_u2404.sh proves no longer useful, it will deprecated in coming months.
 - name: Run scripts/install_python2_kalite-venv_u2404.sh -- if Ubuntu 24.04+ or Mint 22
   command: bash "{{ iiab_dir }}/scripts/install_python2_kalite-venv_u2404.sh"
   when: is_ubuntu and not is_linuxmint and os_ver is version('ubuntu-2404', '>=') or is_linuxmint_22