Set bash instead of dash, update default variables for grub-config

roles/grub-config/defaults/main.yml

@@ -1,4 +1,5 @@
 system:
-    shutdown: poweroff
-    grub:
-        timeout: 0
+  shutdown: poweroff
+  grub:
+    timeout: 0
+    boot_options: quiet nosplash

roles/yavdr-common/tasks/main.yml

@@ -8,6 +8,19 @@
     src: templates/90-norecommends.j2
     dest: /etc/apt/apt.conf.d/90norecommends
 
+- name: use bash instead of dash
+  shell: |
+    echo "set dash/sh false" | debconf-communicate
+    dpkg-reconfigure -f noninteractive dash
+
+- name: disable release-upgrade notifications
+  lineinfile:
+    dest: /etc/update-manager/release-upgrades
+    backrefs: yes
+    state: present
+    regexp: '^(Prompt=).*$'
+    line: '\1never'
+
 - name: add yaVDR PPAs
   apt_repository:
       repo: '{{ item }}'