{% for item in unattended_upgrade %}
{%-  if unattended_upgrade[item] is string %}
Unattended-Upgrade::{{ item }} = "{{ unattended_upgrade[item] }}";
{%   else -%}
Unattended-Upgrade::{{ item }} {
{%     for subitem in unattended_upgrade[item] %}
  "{{ subitem }}";
{%     endfor %}
}
{%   endif -%}
{% endfor %}