Checks improved

definitions/default/check/all/system_unattended_upgrades_are_disabled.check.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+#
+# There are three components working together:
+#   - systemctl status unattended-upgrades.service      (One-Shot-Service, loaded means system knows the service, it DOES NOT run in background)
+#   - systemctl status apt-daily.timer                  (apt update)
+#   - systemctl status apt-daily-upgrade.timer          (apt upgrade)
+#
+# So disable/enaable the Upgrade with:
+#   - systemctl disable --now apt-daily-upgrade.timer   (--now means disable and stop)
+#   - systemctl enable --now apt-daily-upgrade.timer    (--now means enable and start)
+#
+! systemctl is-enabled apt-daily-upgrade.timer > /dev/null 2>&1 \
+    && exit 0
+exit 1