Run an extra install task to provide selected dependencies.

roles/lmn_kde/tasks/main.yml

@@ -1,5 +1,14 @@
 ---
-- name: install desktop EDU packages and some more
+- name: Provide sqlite backend to skip mysql installation later
+  apt:
+    name:
+      - akonadi-backend-sqlite
+    state: latest
+  environment:
+    http_proxy: http://firewall.pn.steinbeis.schule:3128
+    https_proxy: http://firewall.pn.steinbeis.schule:3128
+
+- name: Install desktop EDU packages and some more
   apt:
     name:
       - task-kde-desktop
@@ -8,7 +17,6 @@
       - xdg-desktop-portal-kde
       - xdg-desktop-portal-wlr # share screen in browser
       - kde-full
-      - akonadi-backend-sqlite
       - atftp
       - thunderbird-l10n-de
       - webext-privacy-badger