Fix kernel upgrades

roles/common-system/tasks/kernel.yml

@@ -1,4 +1,7 @@
 ---
 
 - name: Ensure latest backports kernel is installed
-  apt: name=linux-image-amd64 state=latest default_release={{ ansible_distribution_release }}-backports install_recommends=no
+  apt: name={{ item }} state=latest default_release={{ ansible_distribution_release }}-backports install_recommends=no
+  with_items:
+    - linux-image-amd64
+    - linux-base