Add task to remove legacy Kolibri PPA apt .list

Added a task to remove the legacy Kolibri PPA apt .list file.

Author: holta

roles/kolibri/tasks/install.yml

@@ -77,10 +77,11 @@
     gpg --yes --output "{{ kolibri_keyring_file }}" --export DC5BAA93F9E4AE4F0411F97C74F88ADB3194DD81
   when: not is_debian
 
-# - name: Remove stale apt .list
-#   file:
-#     path: /etc/apt/sources.list.d/ppa_launchpad_net_learningequality_kolibri_ubuntu.list
-#     state: absent
+# 2026-03-11: LET'S DELETE THESE 4 LINES LATER IN 2026
+- name: "Remove Kolibri PPA's legacy apt .list"
+  file:
+    path: /etc/apt/sources.list.d/ppa_launchpad_net_learningequality_kolibri_ubuntu.list
+    state: absent
 
 - name: "Download Kolibri's apt key to {{ kolibri_keyring_file }} -- if is_debian"
   shell: "curl -fsSL https://learningequality.github.io/kolibri-installer-debian/pubkey.asc > {{ kolibri_keyring_file }}"